Fits 3 Pin PCM Controlled Ford Alternators, and 2 Pin GM PCM Controlled alternators. This unit allows you to adjust voltage of the alternator from 12.8-15.2/4v
This unit does not fit LIN Controlled ford or GM vehicles. Only fits the plug descriptions above. See pictures below, if your plug does not match that of what is pictured do NOT purchase.
These are modified alternator testers that allow you to adjust the voltage on a pcm controlled vehicle instead of on a test bench.