Question about Cars & Trucks
Power regulator seems to be overcharging and blowing headlight bulbs
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Posted on Jan 02, 2017
SOURCE: 89 Thunderbird, no tail lights
There are 3 wires behind the headlight switch brown+, brown-, and white. All 3 wires are normally clamped together.
I'm not sure what the white does, but when the two brown wires are connected, your parking lights work like they should.
If the brown wire leading from the bundle of cables grounds to the metal switch mount, it will blow your fuse.
If your parking lights don't work, and your rear lights don't come on with the low headlights, these 3 wires could have come undone.
Posted on Feb 24, 2010
Hello my name is Ben. I know you checked the wires, but I'm thinking you missed something. Try unplugging one of the headlights and see if the fuse blows, if it does plug that back in and unplug the other one. This may give you a place to look for a problem in the wires.
Posted on Jul 04, 2010
check alternator out put.should not exceed 15 volts or more. with engine running alternator out put should be 13.5 to 14.5 volts.if your alternator volts over 15 volts alternator has a faulty voltage regulator.
Posted on Aug 25, 2012
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