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George H.
George H., ASE Certified Technician
Category: Chevy
Satisfied Customers: 18390
Experience:  GM Tech ASE Master Tech 15+ years
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2004 chevy express 2500 rear stop turn signal light not

Customer Question

2004 chevy express 2500 rear stop turn signal light not working both sides but stop light above door are ok
Submitted: 1 year ago.
Category: Chevy
Expert:  George H. replied 1 year ago.

Hello I will help you with your question,

Do you have a voltmeter to check the signals from the brake and turn switch if I guide you?

Customer: replied 1 year ago.
Customer: replied 1 year ago.
I already check fuses for left and right side and are ok bulbs are ok there is no 12V coming to rear lamps cause there are supplied by one wire and split to left and right side of the van
Expert:  George H. replied 1 year ago.

Good, in the body fuse block check the stop/turn fuses for power when you have the brake pedal depressed.

Click here

It is 4 and 6 in the underseat fuse block.

Do you have trailer wiring installed?

Customer: replied 1 year ago.
Both fuses are supplied with 12V
Expert:  George H. replied 1 year ago.

OK, then can you check the bulb sockets?

Is there trailer wiring installed?

Customer: replied 1 year ago.
No trailer wiring ,so there is 12 V on fuses and 0V on sockets
Customer: replied 1 year ago.
Stop above doors working ok
Expert:  George H. replied 1 year ago.

If you have 12 volts at both testpoints on the fuses but nothing to the sockets then you have a break between the two points.

Any "creative" or aftermarket wiring done between the two points?

Customer: replied 1 year ago.
Ok I will check wire conductivity and let you know
Expert:  George H. replied 1 year ago.

OK, I will see if they have a harness diagram but it has to be between those two points and each has a separate wire.

Customer: replied 1 year ago.
I was looking into bad body control module front turn signal working ok but faster then usual I will re measure again and check that wire if you have schematic will helpful
Expert:  George H. replied 1 year ago.

I am not finding anything for the harness view but the if the fuses come hot with the brake pedal then it is just a wire between the fuse and the rear. You may want to pull the fuse block to see if the connector on the bottom is corroded.

I will get the diagram for the circuit and the connection

Expert:  George H. replied 1 year ago.

Click here for diagrams

Let me know how I can help

Thank you

Customer: replied 1 year ago.
Ok I checked again voltage and there is 12v on fuse 4and 6 when I press brake
Customer: replied 1 year ago.
Is it two wires going to rear lights ? What color ? Should I look for connection between fuse box and rear light ?
Expert:  George H. replied 1 year ago.

There is a connection on each side, if you open the diagrams I posted above you will see the dark green wire for the right side changes to yellow at the 402 connector, the left side is yellow all the way back through the 401 connector

Customer: replied 1 year ago.
Ok but is only one wire coming from fuse ?cause to rear stop light coming green wire
Customer: replied 1 year ago.
Can you get schematic diagram
Expert:  George H. replied 1 year ago.

I posted the diagram above yesterday? Just scroll up and click where it says "click here for diagrams"

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