Amp Guage Hook-up ??? - Vintage Mustang Forums

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post #1 of 4 (permalink) Old 01-25-2002, 12:52 PM
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The PO diconnected the amp guage and I have no idea where the wires coming out of the firewall went (or where they should be).

Long story short, I bought an aftermarket Amp guage that has a (+) and a (-) side but the instructions are way too generic to understand. Can anyone tell me where I should put the pos and neg ?

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post #2 of 4 (permalink) Old 01-25-2002, 01:17 PM
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First, get the 67 wiring diagram from midlife
This shows a violet and a yellow wire for the amp gauge. Following the wires through the bulkhead connector, we see the yellow wire connects to the positive side, meaning the violet wire goes to the negative side. Since the yellow wire is always hot, be careful with it. Disconnect the battery before doing anything.

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post #3 of 4 (permalink) Old 01-25-2002, 06:18 PM
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To hook up the aftermarket one, what you'll do is hook the + wire from the amp gauge to the batery side of the starter selonoid, disconnecting ALL other wires from that post except the amp guage wire and the battery + cable. All other wires that normally hook to that post will be connected to the - wire of the amp gauge. That's all there is to it ... very simple stuff.

On my '66, since the engine bay is modified to hell and back, I mounted a junction box under the starter selonoid. The - wire from my amp gauge (aftermarket) hooks to the junction box, and I created a Jumper that connects one side of all junctions together. Then all wires that would normally hook to the + side of the start selonoid, or anything else that needs a 12v source, just connects to the junction box.

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post #4 of 4 (permalink) Old 01-25-2002, 06:35 PM
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Thanks came through again !
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