You are looking at the Most Effective Technique Available for Diagnosing 12/24v DC Electrical.To check the wiring from the connector on DCV with Multimeter:Short to Ground: 0.00V, no Ghost Voltage When Shaking Test Leads.Open: Random Voltage/Ghost Voltage when Shaking Test Leads.Connection Issue: Press the LoadPro Button which will pull a .5amp Draw on the circuit. You should see a .3/negligible Voltage Drop and for the most part Battery Voltage should stay at 12v/24v.If there's a huge Voltage Drop, or small but still unreasonable, Wiring/Connection issue. or - Side for Wiring or Connection issue?: You Simply take the '-' Test Lead out of the connector you were testing and hook it to another/common ground. Hit the Load Pro button again: Voltage Drop Still Means the problem is in the '' Wire. No Voltage Drop Means the Problem is in the Negative.WILL SAVE YOU AND YOUR JOB MONEY:First time I used it I was literally about to order a new $1,000/- AC Compressor because the Clutch Went out and the Boss just wanted the whole new compressor because it was old anyway, bench tested the AC Compressor and the Clutch Engaged, New it was in the Wiring, but where?I decided to try the Load Pro on the AC Clutch Circuit and Found that when I pressed the Load Pro the 24v Went to 1.0V(Spec. for that AC Clutch needs to maintain 16V Minimum Under Load to engage.) The Load Pro(used properly per instructions) told me it was on the negative side and sure enough, found issue in the wiring that kept blowing fuse. This was all while people were telling me the issue couldn't be on the negative side,Load Pro ruled out Guess Work and I solved the issue.I love my Power Probe IV and Test Light but Dan Sullivan finally won me over. Cuts Electrical Diag. in half, helps prevent ordering parts. Woks well in conjunction with other tools.
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