Originally Posted by ghorn
Hmmmn... I wonder...
I added two LED cluster type lights under my tonneau cover and tied them into my cargo light wiring. They work just fine...except occasionally they don't. I first noticed that occasionally the "illuminated entry" feature did not work reliably. In other words, the cargo light would not illuminate when using the key fob.
Here's how they fail: If the truck is running with headlights on...and I turn on the cargo light using the switch by the headlight switch...the cargo light flickers one time and dies. It will be a week before the cargo light will work again. Then... If the truck is NOT running the cargo light works fine. But if I start the truck, turn the headlights on, and then request the cargo light... it flashes just momentarily...goes out for another week.
Anyone believe this has anything to do with the LED lights in parallel to the cargo light?
Ok, Issue resolved: The TIPM thinks the circuit is shorted due to the increased electrical loads placed by the cargo bedlights. Fix: Install/Insert a relay to join the bedlights to the circuit, so that bedlights are still controlled by cargo light switch and illuminated entry feature, but actually obtain power directly from the battery thru a dedicated fuse.
Hope this helps anyone else with this sort of issue.