Is there a reason I can't use the radio plug for the volt meter also? Voltmeter is the the only one I was thinking go going to battery with so it's giving me charging status of battery..
That will work but...
There may be a slight voltage drop through that fuse and wiring. Where there are very few fused circuits, several things might be on each fuse. And 3 or more fuses are fed by they same 1 wire so... Turn signals might make your voltage gauge twitch? Who knows?
Blue w/white is after ignition switch, that switch and the fusible link in its path. What it feeds varies with year model. Basically... spark ignition, voltage regulators, alt' field.
This is just what works well for me and those who got a alt to volt gauge conversion from me ( at least a dozen factory rallye gauge conversions ). You could try the radio wire, compare voltage there to battery/other places.
