[Lynn Miner]

I posted a "How To" a few months back on how to install a voltmeter in place of the SPF ammeter. I agree that a voltmeter is better than an ammeter for telling you what is actually going on in the charging circuit. However, for the guys that want to stay with the ammeter, below are diagrams on how the wiring should be done to fix the problems with the SPF cars. The problem stems from the fact that the factory wires the ammeter such that it is placed on the wrong side of the load in the system. What complicates it even further is that some cars have this problem while others do not. It seems to be a quality control issue to me. Be that as it may be, here's how to fix it or change to a volt meter.

You will notice that there are two version of the fix, one from Cantor (the harness manufacturer) and one from Dennis Olthoff. I personally like the Cantor version better but either will work.