Installing Voltmeter Gauge

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Dec 30, 2011 | 03:16 AM

1L243

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Laughing Gas

Joined: Aug 2003

Posts: 836

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Installing Voltmeter Gauge

I am installing a digital LED voltmeter gauge. The instructions say there is a ground a switched hot, I got that but the third wire goes to the "Headlight Circuit" This will dim the LED by 50% when the headlights are turned on. It says NOT to use the dash light rheostat control wire or the dimmer feature will not work. I imagine, this would have to be hot that becomes active when the headlights are turned on. Anybody got a good source where I should tap into the headlight circuit? (1999 F250 SD)

Thanks

Dec 30, 2011 | 08:43 AM

mueckster

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Joined: Jun 2003

Posts: 8,298

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From: Damon (South East Texas)

Brown wire on back of Headlight Switch harness should give you the hot signal you need in "Park" and "Headlight" positions.

Dec 30, 2011 | 08:52 AM

Ponyboychris

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Joined: Jan 2007

Posts: 6,708

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From: Kiowa CO

If I read your post correctly, you need a source for dash lights without dimming? If that's the case, lay down and look up under the center of the dash (straight down from the radio and HVAC controls) and you'll see a rather large black plug for the (optional) Auxiliary Idle Control to use. Grab a test light and probe the plug and there is a wire that activates with the dash lights only but isn't wired to the dimmer switch for the dash lights. Tap into that wire.