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Wiring an hour meter to a 1978 Merc 800

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  • Wiring an hour meter to a 1978 Merc 800

    Hey all,

    I'm trying to wire in an hour meter to my 1978 Mercury 800. I'd like to run it into my wiring harness, which has seven wires: black, white, grey, orange, red, yellow and brown.

    Which one is the accessory wire? And am I correct in assuming that it would power the meter only while the key is in the "on" position?

    Thanks!

  • #2
    Re: Wiring an hour meter to a 1978 Merc 800

    White is the Ign accessory wire. That is the best one to wire it to. Obviously the ground wire is black.

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    • #3
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      Re: Wiring an hour meter to a 1978 Merc 800

      If you have any other gauges on the boat, wire it to the "I" (ignitiion) and the ground terminal on any other gauge. If you have no gauges, then the POS wire gets connected to the "A" (accessory) terminal on the ignitiion switch.

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