Is it possible to lose power from the headlamp switch?

No – You’ve lost headlamp power from the headlamp switch to or through the dimmer switch. With the headlamps switched ON, verify power into the dimmer switch on the yellow wire (Ckt 10). Service the wire connections to the dimmer switch or replace and adjust the dimmer switch as needed.

Why are my headlights not working on my new car?

If you find power there, your wiring problem is in the 12-gauge red wire (or its fusible link), between the firewall junction block and the splice under the dash where the 12-gauge red wire splits into two. If there is no power at the firewall junction block, the issue is in the 12-gauge red wire between the junction block and the starter.

Can a taillight switch work with a headlamp switch?

The caveat: because you posted that the taillights work, unless the taillights have been altered to operate off of a switch that is separate from the headlamp switch, you must be getting power to the headlamp switch via the orange wire from the fuse block. It’s inevitable.

Is there a dimmer switch for the headlamps?

Yes – With the headlamps switched ON, do you have power at either the light green (Ckt 11 – high beam) or tan (Ckt 12 – low beam) wires at the dimmer switch mounted to the left side of the steering column under the dash? No – You’ve lost headlamp power from the headlamp switch to or through the dimmer switch.

How to test the headlight switch in GM 4.3L?

Circuit Descriptions Of The Headlight Switch Connector. TEST 1: Checking Power (Headlight Circuit). TEST 2: Fused Jumper Wire (Headlight Circuit). TEST 3: Checking Power (Park Lights Circuit). TEST 4: Fused Jumper Wire (Park Lights Circuit). Headlight Switch Test Summary. More GM 4.3L, 5.0L, 5.7L Tutorials.

Can You troubleshoot a no head light switch?

Specifically, you’ll be able to troubleshoot a ‘no head lights’ or a ‘no park lights’ problem to the head light switch. Testing the headlight switch (which GM calls the headlamp switch) is a very easy affair and can be done with a multimeter and I’ll show you how.

How to test the headlight switch circuit wire?

Circuit Descriptions Of The Headlight Switch Connector. TEST 1: Checking Power (Headlight Circuit). TEST 2: Fused Jumper Wire (Headlight Circuit). TEST 3: Checking Power (Park Lights Circuit). TEST 4: Fused Jumper Wire (Park Lights Circuit).

What happens when you turn the headlight switch on?

The most common and the most obvious symptom of a bad headlight switch is that the headlights (headlamps) don’t come on when you turn the headlight switch on. You’ll also see: No park lights. No instrument cluster illumination.