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Where can I get a wiring diagram for the gauges.

Tiny
SRBURCH1X
  • MEMBER
  • 2004 PONTIAC GRAND AM
Where can I get a wiring diagram for the gauges in the dash?
Tuesday, March 19th, 2013 AT 6:25 PM

8 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I think you need to check for applicable trouble codes, first. Some of the national brand autostores will check codes for free. Several of the sending units send signal to pcm, the pcm sends class2 data to the instrument panel cluster.

You can check fuses for the instrument cluster and you can check ground. The ground wire is black with white tracer. The fuses are in the diagram.
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Tuesday, March 19th, 2013 AT 10:03 PM
Tiny
SRBURCH1X
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Thanks for your reply. I'm not trying to diagnosis a problem, trying to install new aftermarket gauges using existing feed wires.
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Thursday, March 21st, 2013 AT 8:14 PM
Tiny
JDL
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Are the new gages/cluster compatible with the system?
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Thursday, March 21st, 2013 AT 9:03 PM
Tiny
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How would I find that out?
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Thursday, March 21st, 2013 AT 9:16 PM
Tiny
JDL
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If original instrument cluster connectors wont work with new cluster, you got problems, in my opinion. Did the new cluster come with wiring instructions? If not, I'm not sure how to help? I already explained how the original cluster works.
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Friday, March 22nd, 2013 AT 8:33 PM
Tiny
SRBURCH1X
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I have 5 wires from the existing harness for the gauges, I need to know which color wire goes to which gauge. The new gauges didn't come with wiring. The tach & speedometer doesn;t come with a sending union. I'm trying to hook into the existing harness, and need to know what color wires go to the tach & speedometer, all others come sending units.

Thanks!
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Friday, March 22nd, 2013 AT 8:58 PM
Tiny
JDL
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This is for speedometer wiring. Voltage and ground.

The vehicle speed sensor sends signal to pcm. The Pcm sends class2 serial data signal to instrument for speedometer.

If you get away from factory set-up, I can't help you.
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Friday, March 22nd, 2013 AT 9:20 PM
Tiny
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Thank you.
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Saturday, March 23rd, 2013 AT 6:24 AM

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