Re: Ammeter question
There are multiple posts on this but the summary is that your factory gauge IS a voltmeter. It just deflects in either direction based on which direction current is flowing....alt/bus to battery (+A) or battery to alt/bus (-A).
You have two small wires going to your factory "ammeter". In order to get it to read with a one wire alternator, you should put in a junction post to run the large charge cable to (at least 2AWG). Then run an 8-10 AWG cable from the junction post to the horn bus bar (car supply). Run another 2AWG cable from the junction post to your battery positive. Any added on accessories (amplifier etc.) should be connected to the junction post.
Now, run one of the small black wires from your factory gauge to the junction post and the other to the battery + post. The meter may not read exactly accurately as it is designed around the known shunt value of the original charge cable but it will deflect in either direction based on if the battery is charging or discharging. I cannot remember which gauge wire is pos/neg but if the gauge shows discharge when you're running with no loads on then just swap the two.
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Last edited by Steiner; Jan 31st, 12 at 06:32 PM.