Anyone really enjoy looking at the wiring diagrams? If so, feel free to look at these for me. 2002 with a ZF-6. Reverse lights don't work, but reverse wire fro trailer lights does show voltage.

Manual didn't list reverse lights in the fuse pages. I haven't checked the fuses yet myself. Haven't done any diagnosis other than swap some out the bulbs which I thought might have gone bad. Bulbs were the fancy LED high power bulbs, and they were no longer functioning (burned out), but the new ones that did function didn't work when installed either.

I've got auxiliary reverse lights so this hasn't been critical for me. I'll look at it this weekend if I get done with my other stuff. Anyone with ideas or time to check the diagrams between now and then is free to chime in.

 

After checking fuses, I'd check for reverse light power at the pigtail for the taillights - at the end of the drivers-side frame rail. Unlike the brake, turn, running lights - I don't think the reverse light is fused separately.

I have all the wiring schematics in my other 'puter. If I get a chance I look at reverse light stuff later.

on edit: That 400-something pages of wiring schematics is as much fun to look at as a phone book....

 

Hopefully you get bored and decide to look at the diagrams. I've got the dvd, which reads like 400 pgs of stereo instructions that are out of order.

I'm half tempted to disconnect the wire at the frame and just splice into the reverse wire for the trailer harness. Guess it depends on how the weekend goes. Supposed to flood some more here, so I may have time to lock myself in the shop and look around.

 

 

May just be a bad ground. Someone else had a similar issue not to long ago with running lights and found a loose ground. Check the sockets and bulbs first

 

Thanks Tom. Guess I should have been more clear. I did pull out the meter and there is no voltage at the connector in the tail light, but there is voltage at the reverse light pin in the trailer brake connector.

That means it's got to be a wiring or connector issue somewhere between the tail light and the switch at the tranny I do believe.

Is your DTR connector diagram from an auto transmission? My ZF is a stick.

 

Paul, I checked voltage against at the socket pins against a ground on the frame to bypass that possibility.

 

Gotcha Chris. Now the fun stuff, on your back under the truck pulling on wire bundles, dirt and sand falling in your face. The joys of older truck ownership.

 

 

So it's between the trailer tow relay and the tail lights. Wonder if the tail light and tow are common back to a certain point and then split off? Your diagram doesn't seem to show.

Roland sent me some diagrams last night too. I'll have to look at those. For now, it looks like I get to go work on a friends 02 that has a no start condition tomorrow if it's not raining (again).

 

Looks like its a BK/PK all the way to the rev. lite switch on the ZF6?

The only ground on the frame harness is a big (13mm?) bolt right in front of the pigtail on drivers-side rear frame. You can see the treads sticking outside the frame there.

Yeah, good luck!! I know all of my TX friends are about ready for the rain to stop!! I hope this is at least helping with the drought!!!!!!!!

 

He's got power to the Trailer Reverse Lamp Relay, so the Reverse switch on the transmission is feeding into it. It is somewhere after the relay wiring going on to the rear. There are 2 connection points after the relay. One 12 pin connector (C1046) under the Brake Master Cylinder and another at the frame near the bumper (C401). I sent these pics to Chris's phone after we spoke. I was having browser issues and couldn't post them. Here they are now.

 

Had power at the reverse wire on the trailer harness but not the tail lights. Found and tested the plug under the master cylinder from Roland's diagram and had power at the plug, but not at the back.

Easy enough to trace but I took Roland's suggestion and just spliced in a new wire at the plug under the hood and ran it to the rear. Worked for a day, then back to not working.

But now I no longer have power at the trailer harness reverse wire. The reverse lights flash now going into reverse, but won't stay lit. Pulled the back up switch off the passenger side of the tranny and tested it with an ohm meter. Pressing in the little ball a little shows a connection, but if you press it in too far, it goes back to open. Tried an extra crush washer at the sensor to space it out some but no luck.

Local parts stores don't stock the back up sensor, but Rock Auto sells them for $8 - $14, so now we wait. Looks like Tom may have been on the right track with the DTR, or the equivalent on the ZF which is just a 2 wire on/off switch. Or at least that's what it seems to have turned into.

 

Guess I need to follow up here. After discovering my dvd player on the laptop didn't want to work anymore, I didn't have to waste any time searching for diagrams. I knew black wire, pink tracer from the thread, and Roland gave me a couple of diagrams that showed connector points, so off I went.

First I located the plug under the hood and verified 12v at the plug under the hood, but not at the plug in the back. Took Roland's suggestion and just ran a new wire instead of trying to tear apart the looms and find the issue. Then things started working intermittently. Pulled the back up lamp switch and tested it. It's just a two wire push button switch used on the ZF. It was giving an intermittent signal when I pushed the ball in on the switch so after discovering the local parts stores 1) didn't carry the switch and 2) wanted $30 to order one in, I got one from Rock Auto for $13 (motorcraft)

Tested the new switch before installing it to verify it worked, stuck it in, and had no reverse lights. Double checked power coming to the switch and the black/pink wire that comes out of the switch. Traced that wire and discovered it ran back up toward the front to the connector under the hood, just to plug in to another harness and run to the rear of the truck.

Anyway, didn't look for the bad piece of wire, but it sounds like I somehow damaged the wire both coming and going, so now I'm wondering what else will start to have issues in that same harness.

Everything is back the way it should be now and when I put the truck in reverse, the reverse lights come on.

 

late to the party Chris, but i had the exact same thing. Finding that i had power TO the switch on the trans, but not the bk/pk wire to rear reverse lights, i removed the se nsor. Come to find out, the wires were melted/shorted there. So, used 2 spade female connectors and stripped/heatshrunk to existing wires(after i cut back the bad stuff0 and walah...have reverse lights....Before i threw/had the sensor ordered at FORD, i figured why not give ita shot...saved $100.00+