Trailer turn signals

[slemmer]

I've got a tough one to figure out - (I use to) but now I don't have power to the trailer's left and right turn circuits. On the I/P, for each side of the LT and RT TRLR side, and with the key in the ON position and turn signal activated, I metered the HOT side with no success. Fuses are good. The main turn signals work. I am able to test for ground for each with success, but the trailer turn signals don't energize.

 

What links the main turn signal circuit to the trailer turn signal circuit? Is there a relay, module, or fuse (other than what's in the I/P or engine fuse pane), or fusible link somewhere?

 

Everything worked before.

 

Thanks

[GM-Tech]

The turn signal flasher module controls the trailer turn signals. The input from the switch to that module and the power is the same for the truck's regular t-signals, so if those work, I'd say it has to be the module, which plugs into the BACK of the left ip fuse block.

[slemmer]

The turn signal flasher module controls the trailer turn signals.  The input from the switch to that module and the power is the same for the truck's regular t-signals, so if those work, I'd say it has to be the module, which plugs into the BACK of the left ip fuse block.

 

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Thanks, I know of the black unit - will remove and reseat and see what happens.

[slemmer]

Is it part #15764135 - 2/4 w/opt trailering? I removed it and reseated it with no luck. Before I take the truck in for service, is there a way to test this module? Is there a schematic available for this setup that I can trace out?

[GM-Tech]

Is it part #15764135 - 2/4 w/opt trailering? I removed it and reseated it with no luck. Before I take the truck in for service, is there a way to test this module? Is there a schematic available for this setup that I can trace out?

 

I don't do parts, so can't help ya with the number. The flasher feeds right into the fuses so there's not really anything to trace. The fuses are on the front side, the flasher on the back, so there's no wiring. If you get no power to the trailer turn signal fuses when you use the signals, I don't see that there's much chance it can be anything but the flasher module.

 

The approved test method for the module is to replace it. GM doesn't feel we're qualified enough to give us detailed information on the inner workings of any solid state device, so their diagnosis is, if you've eliminated everything else, it must be the module.

[bandera]

My turn signals and emergency flashers quit working yesterday on my 2000 Silverado. Checked all the fuses and are OK. Pretty sure it is the flasher unit and found out from the dealer it is located BEHIND the fuse panel on the driver side of the dash. IS THERE A STEP BY STEP DIRECTIONS ON HOW TO GET TO IT or any tricks of the trade to make it easy????????????? There is NO reason in the world they should have put that in THAT place!!!!!!!!! Every other vehicle I have ever owned the flashers have been very EASILY ACCESSED under the dash or in the glove compartment. As important an item as this you think they would make it easy to change. THANKS !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!