Headlight issue

Having a strange lighting issue..
(Replaced both bulbs and still having issue.)

When I start the truck, both Daytime running lights come on.
When I turn the lights on (low or highbeams), only RH lights up. (faint amber glow in LH)

When I start the truck with e-brake on, no lights come on (as expected).
But, when I switch on the lights, both the low and highbeams work.
Then, I disengage the ebrake and the LH dulls to a low amber again. (a little dimmer than DRL).

I suspect its a wiring/relay issue.

Any pointers on where to start will be greatly appreciated.

 

Fair chance a chassis ground issue is at play. Dirty ones do weird things.

I'd start with clean battery terminals and track all of them down and check/clean.

I wish I could tell you where they all are located, but I don't know.

 

Okay thanks.

I'll start checking all the grounds and go from there.

Isn't it weird how they work when I start the truck with the ebrake on? And how I lose it when I disengage the ebrake?

 

low beam have a relay? Or check left side circuit.