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Old 06-22-2013, 02:04 PM
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Rzeppa Rzeppa is offline
Cruise Moab Co-Chairman & RS Secretary
Join Date: Aug 2005
Location: Kittredge CO, USA
Posts: 5,891

Originally Posted by thefatkid View Post
Resistance checks are really worthless in most automotive applications. A correct way of diagnosing a problem is using voltage drop tests. Measure from after the load on any circuit to the negative terminal of the battery. Any voltage over a couple tenths shows a possible issue on the ground side. A DMM does not load a circuit and does not provide any real valuable information.
Excellent observation Brian!

In fact, the best way to validate design and workmanship in a high current application is to measure voltage drop across whatever is suspect, whether it is a connector or a conductor. Especially suspect is the return as you mentioned. I like to use star washers on frame and body connections so they dig into any coatings, whether oxidation or residual paint after it has been sanded.
Jeff Zepp
Kittredge CO USA
1971 & 1976 FJ40s, 1978 FJ45, 1987 FJ60
Rising Sun 4WD Club, TLCA #4063
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