92 Explorer Headlight problem

[StanD]

I have a problem on my Explorer. The lights all work except the passenger side headlight which works on dim but not on bright. Changing the bulb insert did not fix problem.

 

[Phager]

It sounds to me that you have an open or excessive resistance in the power lead to the right headlamp. I'd take a look at the wire that powers the lamp, my Haynes manual indicates that it's a red wire with a black stripe. You can use a volt meter to check the volt drop across the length of wire, if it's more then ~0.2V it indicates a high amount of resistance.

Hope this helps

Pat

 

[gsmaclean]

More likely it's a bad ground. With the lights turned off, check the resistance from the ground wire on the lamp to a solid known good ground (i.e. engine case). It should be very close to 0 ohms.

 

[Phager]

I would agree with you there if both beams in that head lamp didn't work. But since the filaments share a common ground, it seems highly unlikely that the ground is the problem, unless of course I'm misread the symptoms.

Pat