If by test the harness you mean checking continuity of each circuit, you can do that with a multimeter or powered test light. You'd have to identify each end of the circuit and put your probes on them to see if the meter beeps (or shows below 5 ohms) or the test light lights up. I'm not sure why you'd suspect a new harness to be bad, though.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.