Sears Automotive Engine Analyzer

I picked up a Sears Automotive Engine Analyzer 161.2182. This is the less common one with two gauges. There is no manual. I have been able to figure out how to use it with one exception.

It comes with a shunt that fits between the battery terminal and the battery cable.
I assume this is for testing the alternator. Does anyone know how to use this, or have a copy of the manual with the instructions for this?


Thanks Slant Six