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2004 Subaru Wagon Headlamps

Tiny
MXB12222
  • MEMBER
  • 2004 SUBARU WAGON
  • 3.0L
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 95,000 MILES
My headlamps (mostly the drivers side) keeps going out. I checked the bulb, and it is good. I also checked all of the headlamp fuses & relays, and they are good. When I remove the headlamp fuse the passenger side headlamp dims, and the drivers side headlamp turns on to match the intensity of the passenger side (both are very dim). The same thing happens if I remove a relay. High beams work on both sides when all fuses and relays are in. Any suggestions?
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Thursday, June 4th, 2015 AT 7:09 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Start by suspecting a broken ground wire. The two major clues are the bulbs do the wrong things or they're dim, and one changes when you do anything to the other side.

To verify a ground problem, if you can get to the bulb's terminals with it still plugged in, turn the lights on, then measure the voltages on all three of them. One terminal must have 0.0 volts. If you find some voltage on all three terminals, there has to be a bad ground.
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Thursday, June 4th, 2015 AT 7:36 PM

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