Headlight issue

[Entropy]

Hi all,

Trying to figure out a problem with my headlights in my 2008 All Star. Here are the conditions:

- the headlights don't work. Occasionally they will come on for a few seconds but 99% of the time the don't work at all. Brights do the same.
- Smart wheel controller and both relays on the firewall were recently replaced.
- marker lights function normally
- fog lights function normally

I suspect a bad ground, by I can't find it. The wires from the bulbs go into a wire loom and eventually, as far as I can tell, go though the firewall without being grounded first. I start at the other end and follow the wires from the switch and they disappear into a mass of wire looms buried under the dash.

I have the wiring PDF from Spartan so I know which wires are supposed to go to ground, but I can't actually locate it. Anything else I should check before disassembling the dash to find the stupid ground?


2008 Newmar All Star 4156

[Skip426]

On my Freightliner chassis , I was having trouble with the headlights when on giving a false reading on the fuel gauge and traced both systems to a common splice before they went to ground . I suspected an undersized wire being used because cleaning the ground stud and checking showed zero ohms from the lights to ground , I replaced the factory ground wiring; with larger wire; from the lights and put a new ground to frame bolt and that has solved my issue With the fuel gauge.