Temp gauge.

[56f100bbw]

Your ammeter no longer reads correctly because of the 3G install. It will still read current that is being used by accessories and the engine, but not current being produced by the alternator.
You will have to get a voltmeter in its place if you want to read battery function anymore.

Completely different wiring scenario with the more powerful 3G alternator, so the ammeter loop no longer has any positive current to sense.
It’s going directly to the battery now, instead of through the old charging wire.

Ok thanks for the info going on vacation tomorrow and leaving the bronco behind I will post when I start back working on it this fall