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My 2000 Chevy van brake lights work until I turn on the driving lights. Then the brake lights work backwards. When I step on the brake the brake lights go off. Bad Light switch?
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change the speedo drive ,where ever it is ,sorry to sound disrespectful but not not many astro vans around here in spain so i have no product knowledge of where the components are
Vehicle electric trouble shooting is the worst. Some of the problems you described the bulbs may have multiple filiments with only some burned out. It may sound silly but change the bulbs. Get a couple of new bulbs and try them in the different spots. Time, road vibrations and spring pressure causes the contacts on the bulbs to wear until they get a poor connection then you get a little arcing that build up a residue and a bulb that test good doesn't work.
Your on the right track with the ground wire. Try a test lamp with a good gound connection and test the different sockets, if your test light works but your bulb doesn't you have a ground fault. If neither work check the switch and fuse before you start tracing the wiring. These are just general trouble shooting tips It's very hard to trouble shoot electrical problems sight unseen.
2002 Chevy Express Van>>>>with headlights off--the rear left taillight works, but no right. When the brakes are stepped on, both taillights don't work. Also, the little lights under the back doors are out. Also, some lights are dim>>rear only.
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