Gauge wiring
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Teching In
Joined: Mar 2014
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From: SF 94110
Gauge wiring just installed a autometer Colbalt oil pressure gauge(electric) I’ve connected the red 12v wire to the IGN port on the fuse block and the ground to a ground under the hood,The white wire off the gauge to the brown wire on the headlight switch. So the problem I’m having is when I turn the car on and turned the headlight switch on it dosent dim,but if I turn the car on with the headlight already on it dims. So pretty much my lights have to be on already before i start the car for the gauge to dim. And yes all my “factory gauges” work and they all dim with the dimmer switch. Any help is appreciated-John
Last edited by jb02ss; Jan 14, 2018 at 12:47 AM. Reason: Misspelled
Launching!
Joined: Nov 2015
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I'm assuming you want to be able to control the light in the new gauge with the other dash lights. Sounds like the brown wire from the light switch that you've connected to is powering the external lights and is not controlled by the dimmer switch. You need to find the gray wire from fuse #16 of Instrument Panel Fuse Block. I've attached a set of schematics marked up to help show you the path of the circuit to aid in finding the correct wire.
Joined: Nov 2003
Posts: 11,328
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From: Jacksonville, FL (originally from Toronto Canada)
I'm assuming you want to be able to control the light in the new gauge with the other dash lights. Sounds like the brown wire from the light switch that you've connected to is powering the external lights and is not controlled by the dimmer switch. You need to find the gray wire from fuse #16 of Instrument Panel Fuse Block. I've attached a set of schematics marked up to help show you the path of the circuit to aid in finding the correct wire.
This issue sounds like a problem with the gauge itself... it dims if the lights are already on when it starts but not if the lights are turned on later. I suggest calling the manufacturer to get support.
