I am having an issue with the passenger side turn signal and brake light not working on a 1993 Coleman pop up. The running light is working. I'm just wondering where to start with this and maybe there is a simple fix or test? It is a 4 pin connection and I have replaced the bulb. Thanks.

Broken wire somewhere. Easiest just to run a new wire. Butt connector (weatherproof) it at the light and at the 4 pin connector.You can try to track down the break, but why bother. Running the new wire is easier.Another possibility is the socket is bad, but I am betting on the wire.

Start with a multi-meter or test light on the vehicle side of the 4 pin connector. If all is good there try cleaning the 4 pin connector. After that, a quick visual inspection of any wiring you can see for cuts or breaks. Then do as stated above, run new wires.

Get a cheap 12 volt test light. Less than $10 and more forgiving when chasing tail light.You need to make a good ground somewhere. Use a scrap piece of wire if necessary. Once you have the alligator clip connected to a good ground you can probe the socket first since you changed the bulb. You could easily have purchased the wrong bulb or not have it inserted properly. A simple test is to remove the same bulb from the left light and put it in the right side. Test your old bulb in the left side as well.If you still have the issue then you should really start at the trailer plug side of the tow vehicle. Could be a blown fuse in the towing vehicle. You need to be careful to not introduce a new problem while trying to diagnose this one. Take pictures as you go and print some out. Document what you did.

What is the tow vehicle?If it is the F150, check for blown fuse in the fuses under the hood.

START WITH THE BLUB.Turn and break are the same filament of an 1157 bulb. Unplug from TV and check TV plug. Disconnect trailer wiring from light. Plug in TV and check trailer wiring. Yellow and green are turn signal. Red is brake, white is ground.

Brake light/ turn signal | Good Sam Community

enblethen
Nomad
Nov 06, 2019
OP: Did you check for fuse in the truck? Each function has a separate fuse.
Terryallan
Explorer II
Nov 06, 2019
cavie wrote:
Terryallan wrote:
Agree check the bulb. however you said the running light is working. But that doesn't tell you the brake light is working. The brake light, and the turn signal light is the same bulb. has 2 filaments in one bulb.

tail light is one filament. Brake and turn is the other.

Ain't that what I said???. Guess I wasn't real clear.
BarabooBob
Explorer III
Nov 06, 2019
Do yourself a favor. Run new wires and change your camper lights to LED fixtures. The total bill if you do it yourself can be as little as $60. I personally solder all of my connections and use heat shrink tubing to seal everything up.
tensch
Explorer
Nov 10, 2019
Turns out it was broken wire at a plug that was about 3 feet from the 4 pin connector. It was wrapped in electrical tape so previous owner must have done a band-aid fix. Bought a new plug and everything is working. Thanks for all the help!!
opnspaces
Navigator II
Nov 10, 2019
Glad you got it fixed. And thanks for coming back with an update. I'm sure I'm not the only one who periodically checks threads he's made suggestions on to see the outcome. :)

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Brake light/ turn signal

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