For a while now the high beam on the drivers side of the truck just come and go randomly. I checked the voltage at the CTM for the light green and brown wire and the voltage goes up and the drops off just like it does at the headlight. Is the CTM faulty or could there be another problem? Sorry I can't give any more info.

 

I'm going to replace the CTM with a used one and see if that fixes it.

 

Replace the halogen bulb, or swap them if you feel curious. One might have a bad filament.

 

dimmer switch????

 

I think the CTM grounds the lights, but not positive on that. Thus your observation.

 

I have already replaced the bulb and it did not help at all. The dimmer switch could not be the problem because if it was the passenger side headlight would be doing it too. I don't know if the CTM grounds the lights but there is a ground behind the battery with several wires attached to it including the headlights.

 

The CTM supplies power to the bulbs. Each headlamp has it's own ground. The ground for the drivers headlight is on the inside fender just in front of the battery.

 

so it's then plausible that the CTM is bad, if the headlamp wire is shutting off.

 

It sure is.

 

I have a completely unrelated question. Are there any 2 ohm speakers that I can get to upgrade the Infinity speakers? 3 of my speakers are blown and I don't really want a new head unit mostly because I like having a tape deck. Haha