Bronco Forum - Full Size Ford Bronco Forum banner

1 - 4 of 4 Posts

20 Posts
Discussion Starter #1
I'm new here, and to fixing up my bronco, just got it in April '10. Plus I'm pretty new to fixing cars in general, only been casually working on cars for the past year or two.

My issue here is getting my tailgate window to work. First the switch is out, which is an easy fix, then I know the motor is out as well. I was reading up here and to switch the motor out, it seams as if you have to lower the window. To do that you compress a safety switch once you remove that pannel on the inside of the tailgate. I did that, pushed it all the way down, had someone else pulling on the window, etc. its not moving at all. I think the gears for it may be stuck together because they haven't been used in a long time. I sprayed it will WD40 and its still not budging at all. Is there another way to change the motor out? or is there some trick into getting the window down?

Any ideas or help would be great. Thanks

710 Posts
I think you're very confused...

you can't even touch the motor with the window down, with the window up all you have to do is unbolt it and voila...

are you sure the motor is bad? did you test it properly? clip the wires in a spot that will be easy to re-attach them together again, then run some longer wires to the motor. touch the wires to a good battery, touching them one way will make it go up, the other way will make it go down.

if it moves then your motor is not bad.

there is a switch on the driver's side tailgate latch (inside the tailgate) that won't let the motor operate unless the gate is closed, my money is on that being bad.

If your motor works doing the test above, then you will have to unplug the safety switch on the latch, I can't remember if it works with it unplugged or if you have to "jump" the switch so try it both ways.

good luck, hope that helped.

after you get the motor unbolted (if you need to) then try moving your window, if it still won't budge you'll need to figure out what's wrong with your regulator (gears and arms) for the window. If it's busted, bent, or just plain out unfixable P.M. me i've got a spare here I'd sell on the cheap. usually the regulator is pretty fixable though.

710 Posts
P.s. I highly doubt the switch AND motor are bad. Most likely if anything it's the motor, but I would try the things I mentioned above before anything else...

the safety switch on the driver's side latch will make it seem like the switch is bad because it cuts power going to the motor.

Driving Stuff Henry Built
-90 xlt, 351w, e4od, man 1356, 3.55, sag, warn hubs, 35s. -73, 400, np435, d20j twin, 35s
8,190 Posts
The motor itself is good more often than not. Part of how I got my Bronco was the PO's frustration after replacing the motor to still have the window not work. I'm using his "Bad" old motor in my passenger window currently.

Here's my regular reply to window questions, complete with links to more pics & info:
The stuff below is mostly cut & paste from an earlier reply, but it covers a lot of tailgate window stuff. Use what applies to your situation.

Be aware that:

-The tailgate latch switch on the driver's side seems to be a common problem, check it early. It keeps the window from being moved when the tailgate is open, & if not latched right, it'll keep the window from working at all. Try pushing the driver's side of the tailgate in while holding the button or key switch in the up or down position. If that makes it work, check out Steve83's "How to align a Bronco Tailgate" link in #5 below & JKossarides info on door striker bushings in link #6 below.

-Ground for the motor connects up front, & at rest runs from there through both switches & both wires to the motor.

-When either switch is operated, 1 side's ground is disconnected & replaced by hot at that switch.

-Ground for the motor is not connected to it's case, but supplied through the wires.

-There are 2 seperate power sources & 2 fuses/circuit breakers for positive. 1 for each switch.

-The same 2 wires are used throughout for both up & down (Polarity is reversed by the switches).

-When the tailgate is open, you have to close the driver's side latch for the window to operate. Remember to open it before closing the tailgate.

Some good resource links:

1-Fireguy50's wiring diagram, see post 2. Great color diagram, it makes it much easier to understand what's going on.

2-Steve83's Tailgate Tech. Great pics & info. Look through the entire section for the portion that applies to your problem.

3-adrianspeeder's pics (He's doing torque pins for a passenger window, for the tailgate you don't need to drill).

4-Torque pins, motors, etc.

5-Steve83's How to align a Bronco Tailgate

6-new bronco owner from hawaii Post 3 has JKossarides' info in replacement striker bushing numbers & wiring harness issues.

7-Fireguy50's Re-wire your Tailgate window switch (FINISHED) Upgrade diagram using relays.


Does it make any noise at all? Like the motor's turning, but the window doesn't move? If so, there are torque pins in the motor's drive gear that commonly break & aren't too bad to replace. See the torque pin, Steve83's Tailgate Tech, & Adrianspeeder's links above. If it makes no noise, then it's probably in the electrical system. Fireguy50's wiring diagram is linked above.

To test the electrical system, remove the access panel from inside the tailgate. Run test wires from the battery directly to the window motor connector (Yellow & red wires coming right out of the motor) to confirm that the motor works. To lower the window, it should be positive to red, & negative to yellow. Be ready for the window to move, keep hands & wires clear. Make all the connections but 1, then connect & disconnect the last wire quickly to see if it tries to go the right way. If it tries to go the wrong way, reverse the wires (This also makes it so that you can lower the window & get the tailgate open to continue testing).

A- If it runs & the window moves when wired directly to the battery, perform the following tests:

A.1- With both switches at rest & the latch switch closed, connect a tester between the positive test wire from the battery & each wire from the tailgate loom at the connector for the motor. Both should read 12v. If they do the ground is good. If they don't, refer to Fireguy50's wiring diagram linked above to trace it down, or tell us what you find.

A.2- With the latch switch closed, connect the tester between the negative test wire from the battery & each wire from the loom at the connector for the motor. The red wire should read 12v when either switch is in the down position, the yellow wire should read 12v when either switch is in the up position. If they don't, refer to Fireguy50's wiring diagram linked above to trace it down, or tell us what you find.

A.3- If everything tests ok, but it still doesn't run, there's a couple more possible causes to check:
-Sometimes the connector for the tailgate motor will test ok, but not make contact when plugged in. You might try backprobing the motor side wires with the plug connected. On mine I removed it & soldered the connections.
-It's possible for a damaged wire to carry enough load to show 12v on a tester, but not enough to operate the motor. Look for worn areas, especially in the loom between the body & the tailgate.

B- If it runs but doesn't move when wired directly to the battery, in addition to your electrical problem, the torque pins in the drive gear are probably broken too. Run the electrical tests in section "A" above, & see the torque pin, Steve83's Tailgate Tech, & Adrianspeeder's links above for the torque pin replacement.

C- If it doesn't run at all when wired directly to the battery, it sounds like it's time for a new motor. See Steve83's Tailgate Tech link above & use the info for removing & replacing the motor.

On my truck there were multiple bad connections, so it was hard to isolate the problem. Someone before me used a ton of crimp connectors :doh0715:. Basically I ended up removing them & soldering all the connections, & eliminating the corroded plug to the motor.
1 - 4 of 4 Posts