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1969 Firdbird HEI wiring

AZ Vince
in Pontiac General Discussion/Questions

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I have a 1969 Firebird with 400CID HEI distributor, Im installing the Holley Sniper EFI and need to find the negative wire on the distributor. 

I see a 3 wire harness attached to the distributor with an orange, black and brown wire (wire maybe original and discolored) so I need to determine which is the negative wire.

I also see a 2 wire harness that appears to have a wire for a tach and something else.

Does anyone know what the 3 wires are in the wiring harness and which is nagative?

 

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