Ford 7.3L Power Stroke (1999-2003) :: Backup Lights And Vacuum Pump Not Working
Jan 25, 2016
My 16 year old F250 4X4 diesel has developed a problem with no backup lights working, and the vacuum pump is not getting power. The fuse (#28) checks out OK, and I'm told to check for a broken wire on or near the backup switch. I don't know where to locate the backup switch. I have the huge Ford Service manuals, but they are written with the perspective that you should already know where the switches are. Where to find the switch?
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My vacuum pump I noticed is running constantly and also my vents are stuck on defrost.
I narrowed it down by taking off the lines going from the tank to the 4x4 solenoid and the tank to the HVAC line. If I plug both lines I get pressure to both but it still won't shut the pump off. Why won't the pump shut off? Leaky tank?
If I plug the red line back into the solenoid I cannot get pressure to come out of the HVAC line. (Switch in cab set in 2wd)
I can make the pump shut off by plugging the main inlet to the pump.
I took the tank out and can't find any cracks or leaks. Could something inside the tank be broke?
Also why can't I get pressure when the red line is plugged into the selinoid?
I can't figure it out. Almost seems like the 4x4 solenoid and the tank are both the problem.
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I am in the process of replacing the complete front end on my 02 CC 4x4. Im replacing the hubs the lockers all seals and spindle axles. complete brakes with power stop and stainless brake lines ......I am going to switch back to the original automatic lockers. I am curious if has a simplified one line for the vacuum routing from the pump to the hubs?
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I think my pcm has gone bad. My wait to start light won't come on an when I turn my key on I can't hear my fuel pump cut on anymore. My vacuum pump is also making a loud noise.
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Went to start my truck (2003, 7.3 F250) one evening and I found the headlights on. No keys in the ignition and the truck hadn't been driven for 2 days. There was a strong smell of plastic and or electrical components burning in the cab. The truck started without a problem. I shut it off and the lights remained on. Cycling the MFS and light switch would not turn the lights off. I had to disconnect the batteries and leave it till time allowed for trouble shooting.
I've had it in my shop for three months now and this is what I've found so far.
-Source of the burn smell is coming from the fuse panel. More specific it's coming from a bulkhead that plugs into the panel. One pin connected to a White wire with 2 purple traces. I've traced this wire to one of 2 small relay packs in the engine compartment next to the driver side fender. I've replaced the relay this white/purple wire connects to as a precaution. This did not remedy my trouble.
-The local ford dealer told me this relay was for the A/C clutch. I located a 10amp fuse in position 10 and removed it. The headlights finally turned off.
-I started the truck and the A/C compressor clutch still engaged and ran. Smoke began to pour from the fuse panel once again. I killed the truck and head lights remained off. All done with the fuse in position 10 removed.
Here's where it gets weird!
-With the key/engine off and I turn the headlight switch on and MFS to low beam the fuel pump is running. Change the MFS to high beams and the fuel pump turns off.
I've looked over the wiring harness and there are no noticeable problems indicating multiple wires being shorted. How are all these issues related?
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A little background information is that I was towing a large gooseneck trailer about a year ago when half way to the destination the lights quit. Not just the trailer but the truck tail lights, turn signals and everything except the headlights. Well after getting there and unplugging everything it stayed the same. Well on the way home without the trailer the lights began working again. All the truck lights acted as it never happened. No blown fuses or anything.
Well things are are going ok since then but I can never get running lights to any of my 3 trailers to work. Turns and brake lights are fine. What gives? All the fuses are fine and the truck running lights work just fine. One thing I have noticed is that on my horse trailer I have the little led lights on the sides operational... I would have assumed these to be the same as the tail running lights.
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I have looked all over the Internet, but I can't find out how to change the lights on the dashboard. I have checked all the fuses. I have no clue have to check the dimmer switch. Though, the over head light does come on when I turn on the switch. All the lights for the check engine and such light up. The dash will not light up during the night. Someone told me that there should be a youtube video or a how to steps. I am very new to fixing my new to me truck. I have checked the how to steps on this forum and a few others.
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I installed a new trailer wiring harness onto the back of my 2002 F250 Super Duty with 7.3 diesel engine. Unfortunately, I was 180 degrees off on my wiring. When I hooked up to the camper I blew Fuse #115 (Trailer Tow Battery Charge) as it connected directly to the camper ground wire. I replaced the 20amp fuse and all other fuses were good. Currently, I have all the truck wires to the harness isolated and have power to all of them except for the parking lights. All the lights on the truck work fine.
My truck has a interior fuse panel on the driver's side as well as two small black boxes under the hood, near the brake booster. The under-hood boxes had only relays in them. Two relays in one black box, three in the other. The box with three relays had trailer left turn and right turn relays. which worked fine. The third in that box, apparently, is for the A/C clutch, controlled by fuse #10. The other black box (with two relays), apparently, are for 4WD Shift on the fly, controlled by fuse #111. So, no relay for the parking lights.
Next, I pulled the fuse panel out a little and checked continuity from the end of the parking light wire (brown with white stripe) at the back of the truck to the back of the fuse box and found that it was a good wire with no breaks or shorts to ground, however no voltage is showing at the parking light wire when I turn on the parking lights. The harness at the back of the fuse box has several wires going into it. The parking light wire (brown with white stripe) is in the same harness as the back-up light wire (black with green stripe) and the back-up light does have voltage, when I put it in reverse.
I'm not sure what happens inside of the fuse box, i.e., how does one fuse run a few wires... is there some kind of circuit board? I know the easy way would be to run a vampire connector from the truck parking lights, or maybe the license plate light to power the trailer lights, however, I'm just not built that way.
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Well today the tach was not working at all and the check gauge, check engine and glow plug lights are staying on. Truck runs and starts great, everything else seems to work except the trans temp gauge. Did a search for the GEM and could not find anything that indicates the GEM controls the tach and warning lights.
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Time to replace the aging vacuum lines to the 4wd and probably anywhere I can find the old rubber stuff.
What is the size of the lines and are they mostly the same?
I'd like to order a roll so I can make ones like the front hubs longer, stuff like that.
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My truck is a 2007 F-350 DRW. I'm not sure when,because I don't use it much in Texas, but My Four Wheel Indicator lights on the dash quit working. I don't see them in the dash at startup either. I'm not sure if the four wheel drive is coming on at all. There is probably a way to check that without driving off into a mud bog, right? Anyway I have looked for blown fuses etc, no luck yet. (15amp#33 under dash and 30amp#3 under hood). These are according to my manual.
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Checked all fuses in fuse box, any other fuses or relays. The pump works when I jump it with a 12volt battery, so I know its good!
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In the past, I've had the common issues of vacuum leaks causing issues as evident from the defrost/ac and then finding busted vacuum lines. Changed out and everything fine for a few years. Now, i dont have 4wd but i dont have the tell tale vacuum leak signs. Also, even if i manually engage the hubs, still no 4wd.
I try to listen for the transfer case to engage when i switch from 2wd to 4wd, I think I hear it engaging, but to be honest the 7.3 makes so much racket Im not positive that Im hearing it, or at least not hearing it the way I "think" that i heard it in the past. I seem to recall a distinctive clunk when engaging, now its barely audible if at all. Now when I switch to 4-Low, there is the distinctive sound, and it does goes into low drive, just that its only 2wd-low, still no front wheel action.
I have never had any issues before other than the vacuum leaks, have never had reason to dig into the transfer case for any reason. The only time it has ever been touched was last summer when i had the BTS installed and all they did was remove and replace.
Do I finally need to either rebuild or replace my hubs? Is it possible not to have 4wd even with hubs manually engaged? Or is there an issue with the t-case? Or is there something else going on? I have access to a lift to attempt "driving" while all wheels off the ground, its just not mine and its a tight fit and a pain to get my truck on it.
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I am thinking on installing a shutoff in the vacuum line that supplies the hubs so I can use 4LO for backing uphill with a trailer without having the hubs engage. Its either that or a switch to disable the PVH solenoid.
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Haven't found any other useful info on this, but local dealer says that's where my truck is leaking oil from, and since it's considered brakes not powertrain the repair won't be covered under warranty ...
Backstory goes : dropped my truck off at local dealer Thursday to repair an oil leak from near front main seal area of the engine discovered while inspecting to initiate a bumper-to-bumper warranty through Ford ESP- their platinum warranty. I figured with all the electronic widgets and non-powertrain stuffs on this beast I wouldn't mind paying for 3yrs/36k miles of trouble-free motoring, y'know?
Apparently it's the O-ring on the brake vacuum pump that's allowing engine oil to leak. I can't even find this thing, just looking for some further explanation. I'm keeping an open mind so far, I don't suspect the dealer's just trying to get one over on me, just trying to be good and educated before I go plunk down for the repair.
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How to diagnose a vacuum leak without a vacuum leak diagnostic tool.
My ESOF won't engage, AC/heat blowers default to defrost - classic symptoms. And while we can leave without AC/heat, we really need the ability to engage 4x4 low, especially as we get higher into the Andes and the roads become rough.
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Went to back out of the driveway yesterday and no picture on my nav screen. It switched to the camera screen but it is just black. I unplugged the connection at the rear of the truck before the tailgate and plugged it back in. Everything seemed fine with the connection. I also have a lock pick installed but if I remember correctly the camera still plugs directly into the nav unit.
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I have a 2004 E350 6.0 with a bad vacuum pump. I tried looking on Youtube for a video on replacing the pump but no luck. Looking for a video or instructions on replacing the pump? It looks fairly easy but you need to be a snake to gain access to the pump bolts.
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1999 E-350 Super Duty (figured the problem would be the same for van/truck)
Problem: Backup lights don't turn on when in reverse.
Diagnosis: Changed the fused (because it was bad) but didn't fix it. The bulbs are both good. Brake lights, turn signals all work. I understand the backup lights are connected to the Neutral Sensor Switch. To test to see if the NSS was working, I put the van in Reverse and cranked... Van didn't crank (and likewise for D, 1-3).
So I guess the Neutral Sensor Switch works. The fuse works. The bulbs are good. Haynes doesn't have much as far as troubleshooting for this issue. What should I look at from here?
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I have a 2013 6.7 and i cant seem to get my 4wd to work in auto position on hubs i think i have it narrowed down to the solonoid for it but cant seem to find location on it.
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I lost my backup lights. The owners manual does not list a power source (fuse) for the 4.0. I do not see a bad fuse, however I suspect that the backup lights are fused somehow somewhere on a 4.0. I do not have a manual for the 2003 Ranger.
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