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Voltage drop/leak to + side of coil |
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TallTex 
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Joined: August-27-2012 Location: Austin Status: Offline Points: 41 |
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 Topic: Voltage drop/leak to + side of coilPosted: September-09-2016 at 12:43am |
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99 SN. Fixed the no volts to system issue by replacing 50amp circuit breaker. However, still chasing a poltergeist...
Prestolite Electronic Breakerless Distributor. Primary system voltage drop test shows mine is dropping or leaking 2.5-3.0 volts from battery to + side of coil. (suppose to be 1-volt or less drop) mine is 9-10 volts at +coil terminal. So I have been R & R battery cables, wires, connections, flexing, moving wiring, etc trying to observe any fluctuation or upside in voltmeter. Batt cables, ignition switch, starter relay, Stumped the chump. Does anyone know normal specs of resistance for: batt cable ignition switch starter relay dash volt meter Thank you. |
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TallTex
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Joined: August-27-2012 Location: Austin Status: Offline Points: 41 |
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Posted: September-09-2016 at 11:27am |
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FYI: I may have discovered my mistake after watching youtube video by "Schrodingers Box", to correctly ID voltage drop, the system must be under the load, not static or "capped" off as Schrodingers video shows or you miss finding real problem and just replacing parts that do not need replacement. (relay, starter, etc.). Now back to the drawing board but with a better understanding of where,what, why to test.
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desertskier
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Joined: December-19-2006 Location: Az Status: Offline Points: 1115 |
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Posted: September-09-2016 at 11:58am |
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You can check for voltage drop without a full load. It just won't be as great. Voltage loss is directly proportional to current flow. Sounds like you have a high resistance connection somewhere.
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SNobsessed
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Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Posted: September-09-2016 at 3:39pm |
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Maybe rig a constant (reasonable) load for test. Then use an IR thermometer & look for what is getting hot. Just another path . . .
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