2002 Trailblazer

radioguy31 · Post by **radioguy31** » Sat Aug 16, 2003 3:18 pm

Does anyone know if the headlight system in the 2002 chevy trailblazer is POSITIVE or NEGATIVE GROUNDED??

cranbiz · Post by **cranbiz** » Sun Aug 17, 2003 9:10 am

Headlight system is Negative ground, but Positive switched

Bob

nmfire10 · Post by **nmfire10** » Sun Aug 17, 2003 10:03 am

It's always a negative GROUND. However, it may use positive or negative side switching.

FMROB · Post by **FMROB** » Sun Aug 17, 2003 12:36 pm

Matt, You are incorrect. The headlight systems in the newer GM systems (for most models) are positive switched at the headlight switch in the vehicle and then reverse polarity at a relay module to deliver a switched negative side to the headlights. The headlights always have 12v positive to them.

So there for the headlight system is negative ground but positive switched (sort of)..

Hope this helps....Rob

P.S. Not all vehicles use negtive as a ground, some commercial vehicles use the chassis as positive, and switch all appliances through a negative field.