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#1
06-11-2007, 03:11 PM
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1993 GMC Jimmy Electrical
I am having an issue with parasitic draw. I have ran the problem down to the ECMB Fuse which powers my ECM, Fuel Pump Oil Pressure Switch, Fuel Pump Relay, and the RWAL Module.
When I disconnect the blue cable to the ECM (E1-F16) it dims the test light. So, I worked my way away from the ECM and went to the different things it powers. No dimming of lights when I disconnect anything that it shows to be powering. Can anyone shed some light on what I may be missing? I just purchased a GM ECM and still same problem. I have no clue where to look next. 
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#2
06-11-2007, 10:10 PM
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Re: 1993 GMC Jimmy Electrical
Cra-Z,
Up to 35mA is a fairly typical standby current drain for the older ECMs. Instead of a test lamp, connect a milliammeter and get a quantitative reading.
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#3
06-12-2007, 12:41 PM
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Re: 1993 GMC Jimmy Electrical
Ok.. I will check that out. I have now started testing the grounds. Voltage drop tests show a few errors from what I believe. Two of the grounding points are showing a voltage drop of .010. Shouldnt this be below .006 ??
This is what I am getting... - at the battery post to the end of the battery cable at the engine block: .004 - from the battery post to the two ground points on the back side of the left head (where the ECM ground points are): .004 - from the battery post to the ECM harness at pins A1 and A2 (System ground): .010 Thanks for the response Blue Bowtie. Last edited by Craz; 06-12-2007 at 04:17 PM.
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