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RCR4V3N wrote:
The issue is the circuits are controlled by the switch position (off-accessory-run-start). Your best bet is to get an aftermarket voltage sensing relay that activates at 14v to trigger with alternator voltage instead of the battery/switch position.
That would work also, though it would fail if the alternator went down. You could set it to 12.9V I've never seen a battery at 12.9V but I have seen an alternator drop down to 13.3 or so with a full charge on the battery.
My lightning is routinely at 13.6-13.9
Buggman, I don't think other than the exciter wire on the alternator you'll find what you're looking for. The vehicles electronics don't differentiate between running and off.
Another option would be to find a source like a cam or crank sensor and use that voltage to trigger a relay.
____________________
2001 Ford Lightning - Built Motor - Built Trans - 2.9 Whipple - E85 - Custom Interior - 537/632 - 11.40 @ 119.6(old setup)
1968 Ford Mustang "Gold Nugget Special"
2018 Ford Mustang GT PP1
1999 Ranger
https://www.youtube.com/user/lightningdusten