Ford Super Duty (1999-2016) :: Battery Light Comes On During Hard Acceleration
Aug 11, 2015
I started to notice my battery light comes on during a hard acceleration. So I have been keeping track of it. When the rpm's hit 3200 and above the light comes on bright but never at any other time. I put a volt meter on it and I have 13.4 volts at an idle, as the engine revs up the voltage climes to 13.9 then when it hits the 3200 mark voltage drops right off to 12.4. It seems like a regulator issue to me. The parts store says my 5.4 has an external regulator is that so or is it built right into the alternator?
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I have a 2000 F350 7.3 2wd Dually - that only only produces cold air conditioing on hard acceleration only stays on for a few minutes then falls away.
The temperature is cold when its going. I've checked the levels and its gased OK. There is no voltage to the clutch on the compressor when it is not working. So I take it, that it isn't the clutch shim/spacing.
If I accelerate hard it comes back immediately. Whether I am going slow at 1500rpm or doing 70mph at 2500rpm - Uphill or downhill. Its seems to need a substantial amount of Turbo boost for just a few seconds to turn on.
I actually bled the system a little and its made it worse. Stays on for a shorter time and isn't as cold. However the low pressure side is still on the high side at 50psi when running.
Its done this for approx 2 years and its getting worse.. And now its really hot outside.
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I have an 06' f350 6Ltr. Over 300 k. Good shape, i have owned it for about a year. My first diesel. Last week it wouldnt start, had a 1/4 tank. Read about problems with other trucks with a broken pick up on fuel pump. So i filled the tank and it started. Next morning used command start and it ran for 1 minute then shutdown. took about 5 minutes of manually turning it over and it fires up ran all day. Does this almost everyday since and now shuts down while driving after hard acceleration and surges under acceleration when on incline or underload. Changed fuel relay, fuel filters. Researched and asked around but getting mixed opinions. I am mechanically inclined but this is a little beyond my scope of trouble shooting and id rather not start throwing parts at it.
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06 250 5.4 40k on it, usually when cold and accelerating engine will misfire and stutter and then continue accelerating. The wrench light will flash sometimes but it wont store a code. This used to be vague in occurrence but has now started to be more a common occurrence even when up to normal operating temps.It seems only to misfire /stutter on hard acceleration or towing/hauling heavy loads. The only answer I got from a mech would be to do a computer reflash, not sure why /how this would fix whats going on.
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I've got a '03 F250 7.3L 4x4 (not sure how much info you need) with many many miles. My battery light came on a couple of months ago. Replaced a battery. Light went out for a day. Checked and replaced the alternator. Light went out for a couple days. Cleaned the battery terminals for better connection. The battery light is off when I first start the truck, but depending on what I've got turned on, lights, radio, AC, the battery light comes on with in 15 to 30 miles down the road. I had the batteries and the alternator rechecked yesterday and everything seems to be charged and charging.
- Should I replace the wiring to the alternator?
- Are there any fuses I should be looking at or for?
- The alternator is a rebuilt one from Autozone, should I get a new one?
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Battery light came on today, I figured were in need of replacement so I got new ones. Light is still on, until I reach about 1800 rpm. It goes out until truck idles down. Can an alternator do this? I always thought when they went, they went.
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The battery light is on when running. The light is dim at idle. Light is bright when driving with rpm's. The battery voltage is 12.8 per my older volt gauge. Alternator out put is 14 volts at idle and with rpm (2,000) +. I had the Alternator checked at AutoZone in there parking lot. Meter hooked up. The alternator passed all test.
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The manual just says it's a charging system problem.
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I put an O'reileys alternator in my truck today. Drove it most the day and did some plowing with it and it was fine. I just went out to run to the gas station and now the battery light is on. The voltage is still good.
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2005 F-350 6L diesel .... Put new batteries in it a week ago.
Been running good then the radio quit a couple of times. It came back on after truck was restarted. This morning I go to town and the battery light comes on. I stopped and started about 5 times and on the 6th it wouldn't start.
I got a boost and started home it , started to try and quit when I was almost home. Was so dead the power windows wouldn't even work. Have it on the battery charger now and it starts right up but the battery light is still on and the ABS light is on.
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I have an 06 F350 with the 6.0 powerstroke. My battery light started coming on and will go out for a while, then come back on. Sometimes it flickers a little. I have checked/cleaned battery terminals (there was no corrosion). I have replaced the alternator. The batteries are just over a year old (10/12). I have not had any slow starting or any other symptoms other than the warning light. I am still having the same problems after replacing the alternator. I have checked with a voltage tester and it was reading 19+ when the light was off. When the warning light is on it was jumping from 12 - 15. This is an old tester so I'm not sure that it is working correctly. (not sure why I am getting the 19+). I'm going to go buy a new tester, but I was wondering if there is something else that could be causing the warning light. I know very little when it comes to electrical issues.
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OK I have 14.04 volts at the batteries with the engine running but my battery light is on. I had the alternator checked off the engine and on the engine and it tests good. Shows good batteries and good charging. Is there something internal to the alternator that would make the light come on even though the alternator is charging ok? Or is there something else that would make the light come on. This is on a 1999 F250 Superduty Powerstroke 7.3.
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Long story short: I bought my 2003 F-250 super duty 6.0 used back in January. It had one Ford OEM battery and one Walmart special. I had them tested and they were both completely flat. Replaced the set of batteries the next day. Since then, upon cranking the truck, the battery indicator will be illuminated while the truck is running. It will stay on for a length of time that varies based on the day. It will eventually turn off after driving a while, but will come back on if I kill the truck and crank it again (like when running to a store).
The batteries have been tested 4 times and test just fine. No problems with the batteries. The OBD 2 computer/monitor I have installed reads a voltage of around 13 when the truck is running. What to do to solve this problem. It isn't a major issue as the truck always cranks fine and the batteries are not damaged or anything, it is more of a annoying thing. It bugs the crap out of me.
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The battery light is on on the dash. I checked both batteries with the ground wire removed, and they show 12.85 and 12.84 volts, they are clean and not in need of water. The battery light will go out after around 15 minutes on the highway, but not around town, and if I shut off the truck in town, the next start is at a very reduced amperage. Alternator packing it in?
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I have a 1999 f-350 V-10. My battery light came on, making me believe that my alt. has quit. I can't see the plaque on the alt so I can't tell the amps. Does my serial number on the truck tell the amps, or do i have to remove the alt to check the amps?
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I have been reading several past post regarding the misfire while in OD and going up a small hill with light acceleration around 45 to 55 mph. Everything points to the COP so I replaced it today. Still getting the code after 20 minutes of driving around. My truck shudders and looses power. I can either let up on the throttle or hammer down on it to eventually smooth it out and everything goes back to normal.
Check engine light flashed but didn't stay on. My scanner does report misfire on cylinder 7 (P0307). Haven't owned this truck very long so I don't know much of it's history except OASIS report shows nothing alarming. Guess next step is a new set of plugs.
Another first today, is the tachometer is stuck at 4500 rpm. Shut the truck off and let it sit for an hour, then went back to start and tach. acts like 4500 is the new zero and running engine at 1000 rpm now indicates 5500. 2007 F250 SD 5.4 ....
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2004 F250 v10 xtl 260xxx. Started off by using my remote start, truck started up ran for about 5 sec then shut off, then restart itself and shut back off. When I manually started it, it ran fine. I noticed my battery light was on and as I was driving it would flicker. First thing I did when I got home was clean all my connections to see if that worked. Battery light still on, checked my volts on my battery and they were at about 11.8 with a slow but steady drop while truck was idling.then checked my alt, that too was at about 11.9 with a stead drop.
Alt was only about 7 months old and I had a warranty on it so I had it replaced at Napa and had them test it there. Good alt. Installed the new alt charged up my battery and turned it over. Battery light still on and flickering. Checked all my wires for corrosion, checked all my grounds. Everything checked out. Checked my battery again 12.4 with the truck off, cranked it over and it was back at 11.9 with a steady drop and almost the same reading with the alt. I replaced the battery as well yesterday, seeing how it was about 7 years old.
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I was driving and all of a sudden the radio died, battery light came on, Power windows and interior lights died, gauges died speedometer went all the way up to 100. The Head lights, turn signals and heater work. When I got home I opened the hood and the battery was boiling.
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I currently am driving a 2001 F-350 V10 SuperDuty, and recently the battery light was blinking. I replaced the alternator in it, but it didn't work. I thought it was bad so I went and got another and it still didn't work. Turned out that the alternator wasn't big enough. I then went BACK and got a larger alternator, and it still won't work. Now the battery light is solid, and I'm getting absolutely no charge out of the alternator. I checked all the fuses and nothing is wrong. It seems like all the things you think could be wrong are running perfectly fine! What could be wrong. The truck will start, and idle, but will run off the battery only.
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My alternator quit charging last night. Was pretty much a sudden onset as I was driving down the road and left off the accelerator the battery light came on and lights dimmed a bit. When I stepped on the accelerator again they bat. light went off and the lights came back up.
At idle I'm at 11.77v. I've pulled the plug on the back of the alternator and I'm getting voltage on both the red and green wires that go into the plug with the engine running. Is this correct?
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Pretty much as the title says, I'm having an interesting electrical gremlin. Ford 7.3 super crew 2002 lariat LE.
I have batteries from 2015 that are losing their charge, both of them. It's like the alternator isn't charging them. Truck will struggle to start until jump started, then she's fine.
Symptoms are:
ABS light comes on when as best I can tell the batteries aren't getting charged. Not the battery indicator.
Now that the batteries are low enough, on the instrument cluster the little light the powers the mile LCD screen dims when it's not getting power (but it's fine when the batteries have charge.)
All accessories work when driving, but I haven't been able to drive a long while on the "not charging phase" to see how low they're go.
Batteries register dead (now) because they haven't gotten charge in a while.
When the alternator IS charging or "connected" I can leave the truck idle and she'll charge the batteries, truck will start just fine on the next run (no parasitic drain.)
Driving causes this to happen randomly, doesn't happen when I'm stationary, nor do I believe it CHANGES state (so if I'm idle it won't suddenly NOT charge if it was charging before.)
Narrowed down to 2 probable things.
Alternator
Bad alternator to battery cables
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