Tailights Inop when hooked to TM

12-29-2011, 06:57 PM

When I have my F150 electrically connected to the TM I have power to signals,turn signals, brake lights but I have no tail lights. Any suggestions or past experience on what might be the problem. Trailer or Truck?

Thanks for the input
Pagosa

rvcycleguy · 12-29-2011, 07:06 PM

Should be a dual filament bulb. Half the bulb is stop lights and half is running lights or as you say tail lights. Check the bulbs. Hard to suggest that both are out at the same time though. You might check the 7 way plug for debris, corrosion on one of the terminals or bent terminal not connecting inside the plug harness.

12-29-2011, 07:09 PM

I forgot to mention that none of the side marker lights are working either. I will check the pins.
Thanks
Pagosa

12-29-2011, 08:16 PM

Not sure about your 150, but my Silverado, has a separate separate set of fuses for the trailer lights. Check the plug on the truck to insure the signal is at the connector.

Barb&Tim · 12-29-2011, 08:20 PM

Have you checked all your fuses in your TV? If so and they are all ok then a check at your TV bargman connector for the presence of 12v on pin (#3 Green -- tail/running lights) should be next.

Tim

12-29-2011, 10:31 PM

What Bob said...get a pin out drawing and a DVM, check the signal on the truck connector first, then start following it back. Check your trailer ground wires carefully if all is good on the connector.

scrubjaysnest · 12-30-2011, 04:46 AM

If you don't find anything as mentioned above, check the intermediate connections in the lower refrig compartment. TM used bullet connectors on ours and they were the wrong size for the wire. This resulted in bad connections.

**Bill** · 12-30-2011, 10:35 AM

I agree that the first step is to check the voltages at the back of the tow vehicle. There is a pinout diagram in this album

http://www.trailmanorowners.com/foru....php?albumid=8

Bill

12-30-2011, 11:24 AM

Did it ever work on the F150?

12-30-2011, 06:51 PM

At this point I have power coming from all pins on the truck. Not sure if Im doing the right checkout on the trailer but I used a ohm meter on the pins on the trailer receptacle and all of the pins returned a reading except the #3 pin. Im assuming I have a open circuit on #3 pin for the running lights. Im not an electrician so any suggestions?
Pagosa