Quote:
Originally Posted by wcjeep
Do the lights act differently when connected straight to the battery? No relay, no switch. I'm running cheap LED rock lights on my Offroad Jeep and Dodge Tow rig. They emit zero noise. Is the Jeep owner running factory style spark plugs?
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We haven't disassembled the wiring, the installer connected directly to the factory Jeep harness and we didn't want to undo what they did to redo it again. Although, I suspect it would have different behavior. BTW the installer is reputable.
I don't know about the spark plug wires, but the Jeep is well maintained. This only happens when the engine is not running, what is your thought on the wires?
My suspicion is it's a ground problem somewhere, for a few reasons. The Jeep is a recovered flood vehicle. The other part is if you ground to the chassis (which might be a crappy ground being a flood vehicle) you have a long and resistive path to the negative terminal. It gets worse with the head lights on too. The long path, plus loading will result in a voltage drop and possibly susceptible to noise. When we are running one light only, it goes away.
When the engine is running the voltage is higher and able to "power through" (pun intended) the bad ground.
The lights are current driven, and regulated internally with an input of 9-30V; however, a poor ground will be noisy and affect performance.
In the end it's a non-issue, because it doesn't happen when the engine is running. Once we figured this out, we didn't bother to probe the the lights and started drinking beer.