Tail light stays on ... Lance 992

wnjj wrote:

The tail and brake are different lights or at least different filaments in a bulb. The point is if it's the tail light, the other side and the clearance lights are wired in parallel to it.

Since it's by itself, it's likely the brake/turn light (same filament).

I'd check inside the 7-pin (or whatever Lance uses) for a strand of wire that is bridging between the charge pin and the left turn pin. If it's the Lance plug, a diagram I found shows the left turn and +12V are next to each other on the bottom.

As I think about it, the original owner (re)wired the umbilical from the truck. I bet that's where the issue is.

Freep wrote:

jmckelvy wrote:
Is it really the tail light or might it be the left turn light? Tail lights are normally wired in parallel with both rear tail lights as well as the marker lights on the same circuit. Either way it sounds like you have some sort of wiring issue.

It's the leftmost red light. So that would be tail/brake light.

The tail and brake are different lights or at least different filaments in a bulb. The point is if it's the tail light, the other side and the clearance lights are wired in parallel to it.

Since it's by itself, it's likely the brake/turn light (same filament).

I'd check inside the 7-pin (or whatever Lance uses) for a strand of wire that is bridging between the charge pin and the left turn pin. If it's the Lance plug, a diagram I found shows the left turn and +12V are next to each other on the bottom.

This guy had the same symptoms on a TT, but with a standard RV 7-way plug the right turn is next to the +12V. Unfortunately he never posted again.

lol, I've suffered in silence with similar. It's frustrating.

Our right turn, LED, will come on and stay on. Sometimes. For weeks on end I found out. I've checked, traced and back tracked, nada. Wiring isn't foreign to by by any means. I have 20-25 trailers any given date, and up keep and diagnosis is constant.

I usually start with the obvious and most likely culprits, the plug ins. They get the most 'action'; even one little strand on a wire crossing can pick up enough current to keep an LED on. Problem with campers, trailers, etc, they are not very good at maintaining color coding (brn tail, green right, yellow left, etc) and the wires disappear into areas not readily accessible. All this leads to a hard to trouble shoot problem and often, hard to fix/work around.

My light doesn't come on currently, so I don't worry about it this month.

Let us know what you find.

That looks like the Curt test light I just bought which is available at Amazon.

RoyB wrote:
Are these LED lights... I installed LEDs in my popup trailer ceiling lights and found out just a drop of water over the ON-OFF switch will turn on the LED lights... They don't draw enough current to need a strong make break contact like the ON-OFF switch would give

...

I have one of these 7-WAY TEST modules that will plug into the 7-way socket and then I go through all of the truck safety light controls and make sure the truck side is not doing anything funny... Saves me alot of time knowing where the problem might be originated from...

Yes, they are LED lights.

7 way test module! Excellent. I will get one.

jmckelvy wrote:
Is it really the tail light or might it be the left turn light? Tail lights are normally wired in parallel with both rear tail lights as well as the marker lights on the same circuit. Either way it sounds like you have some sort of wiring issue.

It's the leftmost red light. So that would be tail/brake light.

Is it really the tail light or might it be the left turn light? Tail lights are normally wired in parallel with both rear tail lights as well as the marker lights on the same circuit. Either way it sounds like you have some sort of wiring issue.

Are these LED lights... I installed LEDs in my popup trailer ceiling lights and found out just a drop of water over the ON-OFF switch will turn on the LED lights... They don't draw enough current to need a strong make break contact like the ON-OFF switch would give...

Also light systems that have frame ground connections really do strange thing sometimes... A burned out shorted bulb or socket can do strange things to you...

I guess i would start tracing things out with a multimeter try to see what is going on...

Haven't played with any of the TC DOT safety lights circuit but on my truck 7-way connection I have one of these 7-WAY TEST modules that will plug into the 7-way socket and then I go through all of the truck safety light controls and make sure the truck side is not doing anything funny... Saves me alot of time knowing where the problem might be originated from...



Roy Ken