You can check resistance between the ends of the ground straps. Or just clean them really well and be done. From your checks it seems you could easily use the coil + to trigger your relay. Is it a conventional 4 lug relay? If so, find a place that's most convenient to locate the relay, then wire it as such:
12 volt fused power to terminal 30
Sniper (pink) wire to terminal 87
Wire from coil+ (added by you, leave the originals connected at the coil) to terminal 86
Good ground wire to terminal 85
Hopefully the Sniper directions tell you the expected load on that wire, size the fuse accordingly.
The 12v power is pretty much at your discretion for where you get it from. A small load could probably be powered simply from an unused fuse block spade terminal, or with an inline fuse, straight from battery(probably better due to cutting out potential alternator noise).
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'65 Tempest 467 3650# 11.30@120.31
Last edited by Scott65; 05-04-2022 at 11:31 AM.
Reason: Addition
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