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When i turn on my high beams my low beams go out and my high beams do not come on . my truck is 2001 chev 3500 4x4 silverado. I have replaced the dimmer switch control unit all ready. this truck also has auto head lights.
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Hello check when the high beam is on pull the bulb and check to see if you have power or not i have had this problem before and some trucks use a ground to turn them on and some use power the switch could be the wrong one and you might have to add a $6 relay to set a ground so you don't have to replace the switch again
You are correct! When the high beam is turned on the low beam should still be active! What type of bulb are you using? Are the high and low beam from the same bulb or separate!
NO YOU HAVE TO REPLACE HIGH BEAM LIGHT BULBS WITH HIGH BEAM LIGHT BULBS BECAUSE HIGH BEAM LIGHT BULBS AND LOW BEAM LIGHT BULBS TWO DIFFERENT TYPES OF BULBS.WEAR CLEAN LATEX GLOVES HANDLING THE HEADLIGHT BULBS WHICH IS HALOGEN LIGHT BULBS, OIL FROM FINGERS OR HAND WILL CAUSE HALOGEN BULBS TO OVER HEAT BLOW OUT.
The headlamps are controlled by the Body Control Module (BCM) The first thing I would check for is the Headlamp Hi Relay. It is located in the underhood fuse/relay box. If pulling the relay out turns your high beams off, try taking out the low beam relay and putting it in the high beam position. If the headlamps stay off, try plugging the high beam relay into the low beam position. If the low beams now come on, the relay is shorted.
If none of this works, I would recommend scanning your BCM to see if there are any fault codes.
Try turning on the high beams and see if there is power to the socket where the bulbs plug in. Low beams are one connector and the high should be another. Just go from socket to ground with test light or meter.
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