Ford F-150 - 1997-2003 :: 1999 - Low Battery Light On?
Aug 2, 2017
1999 F150
automatic, v8 4wd 430K miles Low Battery light is on.
Other than the usual things to check: battery cable connections, corrosion at contact points, checking with a voltmeter, having battery tested, having alternator tested for volts and amps... are there other known issues with this year model/setup?
Also, once the battery is changed, is there a way for the codes to be cleared out or reset without having to hook it up to a computer?
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Not mine, but the guy claims his trucks battery light and CEL are on with the key off??? He's battery goes dead (it is new) and only 12.3 volts running with it revved up. My inclination would be alternator, but how can those 2 light in the dash be on with the key off? He did replace the ignition switch.... nothing ...same condition.
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I have a 2003 F150. When the temperature is hot outside and I have the air conditioner on the Gauge will sweep and the ABS light and battery light will go on. The battery gauge will go to high charge. When RPM is dropped (idle) or when the RPMs are increased to pass a vehicle, everything returns to normal. Power windows will not work but all other functions due. It will boil my battery if ran to long like this. I have changed the alternation and battery. Only happens in the summer?
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This ID10T light came on last weekend, and I just started trying to fix this. I found this post [URL] ....., but this isn't my problem.
The alt is old, but tested good four times at Napa. Battery is three years old, and it's holding good charge. My scan gauge 2 is showing 11.4-11.6, and I'm guessing this is what's throwing the code, although there isn't an actual code.
I don't have the money to go just start replacing parts, and I need this truck for next weekend, 10/3/15, so I hope to find something by then.
At 2000rpm the SC2 is still showing 11.6 volts, so would it be the charging system? Volt reg? Something in there is clamping the voltage down. At 18 years old, and 250k miles I'm not afraid to put new parts into.
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My 97 with a 4.6 has had some charging issues. It started when I left a trailer hooked up with dome lights on (ignition to the on position, not running, for the trailer hot circuit) and it drained the battery. I boosted it to move it and put the charger on it. It ran fine till the other night (a week later) and on the road the CEL light came on. I didn't get another mile till the lights dimmed and the dash lights went out and the radio started flashing. I turned off the radio and heater to get home (another 2 miles). On the rest of the way it would drop to 8volts then up to 13-14 and the headlights would get bright. Then it would drop back down.
The whole time the battery lamp in the cluster never came on (forgot there was one). I pulled the alternator and took it in to have it tested. They said it tested fine. I re-installed it and fired the truck up and the battery lamp would fade in and out. I put a charger on the battery again overnight and now when it runs the battery lamp only comes on at idle and goes off when I increase the RPMS past about 1,400.
Is it possible that the alternator is going bad and the tester was running it at high enough RPMs to generate proper output?
I made sure to check the wires on the connectors going to the alternator when I re-installed it and made sure there was enough tension on the connectors before putting them on the pins. I've also thoroughly cleaned the battery clamps and inspected the wires at that point for corrosion. I haven't traced it back. If it is related at all, I had it in a few weeks ago for tires so I had an oil change done and they replaced the serp belt. Should I have it tested elsewhere, should I start tracing wires for corrosion?
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I have a 1998 f150. Was driving down the road the other night and the truck loses all power. I have replaced the alternator and the battery loght stayed on. So, I took both old and new altrrnator to parts store and had them both tested and they bith passed. Is this a commomn issue?
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The other day the battery light came on. Of course the useless "gauge" still reads normal but that is another rant.
Checked voltages today:
Battery reads 12.0 volts key off, 11.83 key on, engine off, 11.65 engine running.
Obviously discharging and I am guessing it is the alternator. Do these trucks have an external regulator that may have failed or is it in the alternator? I'd hate to spend $150-200 for an alternator only to find out it doesn't solve the problem.
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It all started......when I got onto the highway and glanced down at the gauge cluster and noticed my battery light was on and kind of flashy (clipping, so to speak)...and that I was in 2nd gear...whoops. (My tach's busted, else I probably would have noticed that sooner.)
Quick correction and things are right as rain. The next day I go out and make 3-4 stops with less than 10 minutes of drive time between each. I'm almost home (battery light's been on intermittently since last night) and the idle slows slightly and the windows no longer work. I make it home and the gauge cluster is dead by now, but leave the truck running, grab a socket wrench and pry off the positive battery lead. Truck dies.
I'm thinking alternator, so I pull the battery and charge it inside, then pull the alternator the next day and have it tested. Tests fine (putting out 1430 (is that mA?) per O'Reilley's). Crap. Cleaned all connections (including taking off the negative terminal grounded to the starter and shining it up a little, then pulling the connections off the firewall and sanding them lightly), checked 20A inline blade fuse, both 175A fusible links, but it's still not charging. If I want to go anywhere, I have to pull the battery and charge it inside.
I was thinking it might be the voltage regulator, but I just called O'Reilley's and they told me that the test on the alternator included the regulator. I just confirmed that the belt on the pulley is okay. What did I most likely fry that caused my battery light to come on? (97 4.6L)....
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F250 LD 99. Battery light flashing from time to time. When it happen voltage gauge in dash go up (but not in red zone so far). All other light are blinking too but not on and of like battery warning light then like stronger - weaker. So far at Internet is said should be ground. I saw one ground at firewall close to negative post of battery but where is other ground? Can it be voltage regulator (alternator)? Did clean battery posts, didn’t work. 4,6 engine. Voltage at battery posts with engine on is 14,7 - 15,1 V. With engine off 12,3 V.
Didn't managed to check voltage when is battery light flashing as it only happen when I drive not at idle.
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1998 F150 4.6 automatic.
Had problems with battery light. Was intermittent. Battery cables wouldn't stay tight, replaced them, light stayed off. Light back on now, constant. Battery reads 12.5ish off, 14.3ish running under load (lights, AC, etc.).
When truck is started, even cold, it doesn't rev up the RPM's and then die down to idle speed. It just goes straight to around 550rpm and surges slightly up and down between there and 650ish. Can these be related?
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So i have had a problem with my battery lately and i have done all the steps to try to fix it. First we took out the alternator and battery and had them tested at orielys and the alternator tested positive and the battery tested positive so we had them charge it then put them back in. They told us it is probably a parasitic drain which means something is draining the battery so we detached all my aftermarket stuff like my air compressor train horn and led lights on my grille guard and it ran fine for 2 days without dying. Well this morning i went to start it and it was dead again....
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I can charge it off someone else battery and it will start and drive, but by the next morning it's dead again. Truck charges fine while truck runs so I don't think it's the alternator. 1999 4.2L V6 ....
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just got finished putting her back together from a blown intake manifold gasket and run for a few miles to get rid of any cob webs and then my battery light comes on. just replaced the battery last week. and I tested the alternator and it charging at 14.5 volts bat reads when disconnected 12.9 volts so I am not sure why my battery light will come on.
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Just bought my first F150. 1998 XLT 4.6l automatic. 126K miles, looks like it was mostly garage kept. All power, A/C, etc.
Picked it up this evening, drove it home after dark. About a 30 mile mostly highway speed drive. Everything went fine, no problems, no hiccups......Until I turned on my last street, about a half mile from home. The battery indicator light on the dash started blinking intermittently. I didn't notice anything else, just the red battery shaped light blinking.
What would cause this, what should I check? I don't want a big problem when I haven't even transferred the title yet!
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Over the past weekend i noticed all the electronics having a slight "flicker", so I figured my alternator was on its way out. After replacing the alt with a reman, I still had the issue. Then, replaced it with a new new one and the issue still persists. I will be getting a meter to test later when my buddy gets off work. The gauge on the dash is running high and battery light is flickering. Is there something I am missing? I ran another ground to frame also.
2001 SCAB 5.4 144,000mi 4x4 ....
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Vehicle is 1998 F150 with 194k. The battery is 1 1/2 yrs old and belts and alternator are original.
Yesterday morning my VHF and dog tracking eqipment started humming with the truck running. The hum on the tracking eqpt. only happened when I pointed the antennae over the direction of the hood with truck running. When I shut truck off everything is normal. Later in the day the battery light came on. The battery light would go off if I kept it over 2400 rpm's. The charge on the dash was normal but as I got closr to home last night it dropped to almost nothing and the lights were very dim.
I am thinking alternator. What I am confused about is the humming noise in the background. The tracking eqpt. is completely separate from the truck while the VHF is direct to the battery with an iline fuse. Bad voltage regulator?
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The past few weeks the dashboard warning light for my alternator/battery will occasionally light up while driving down the road. Whenever it does, my plug in voltage meter shows a healthy 14.x reading. It usually goes out after a few seconds, but will stay lit up for as much as thirty seconds. So other than voltage being too high or too low, what else will cause the dash trouble light to illuminate?
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Battery light came on about two months ago it would flicker. So i had Auto zone check it out batteries were good just needed a charge. so i charged them no fix so i said alright ill do the Alternator did that and then beginning of this week it happened again so checked it went back got a replacement alternator since they said it tested bad. Put the new one on and didnt change anything. Check my batteries they were reading 10v each. I charged them and they wouldn't hold a charge. so i replacement both batteries.
So i have a new alternator and two new batteries light is still on. Contacted my tech (whose a friend) he said to check the wiring going to the alt he said both wires should read 12v on constant other when the key is turned on. Tested the constant it has 12v other reads 6-8v with key on.
He also said sometimes the wiring on the X pipe can short the alternator? i unhooked all the wiring from the Xpipe nothing changed per battery light being on or off. So what should i do.?
Also my dash lights don't work but that's been like that for awhile (bulbs are all good).. Forgot to mention sometimes the light goes off but seems to stay on 90% of the time.
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I have an odd issue, 2003 7.3L f250 ... My battery light flickers on and off, I had the alternator tested at a alt rebuild sale place here locally, I don't always trust the auto zone techs, also had the batteries tested at interstate batteries. both batteries good, alternator good.
I think my connector is bad on my alt, not the one that goes to the battery, output is 13.8 to 14.1 btw......there is another connector that is a PITA to get off. I think it is bad, I played with it and applied some dielectric grease had the light go out when I wiggled it.
Can just the connector be replaced?
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External LED hooked to GPR
I have gone through around 7 alternators in the past 18 months. I currently have a new NAPA alt and new interstate batteries. Today I noticed that my battery light is on again. I also noticed that my yellow squiggly Glow Plug inrush dash light was on at the same time. However, I do not believe that my GPR was active BECAUSE... I have an external red LED that lights up any time my GPR is active. When my GP dash light came on my external light was off. I had just driven 26 miles and my truck is warm and the outside temp is around 70 Fahrenheit.
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My battery light come on this morning. The volt meter is sitting right where it always has though. I noticed that the battery light is kind of pulsating with rpm and at idle its very very dim.
E99 F-250 PSD ....
Where should I start?
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