XHighOctanex Posted May 11, 2017 Share Posted May 11, 2017 See if you can get that alternator checked at a parts store, they'll normally do it for free. IIRC, bad diodes in the regulator/rectifier can drain a battery like that, even if the thing is charging normally while running. It should be grounded by the frame and mounting bolts. Open ground wouldn't cause a load when it's off. Check for current in the control wires. Check for current in the main output cable. Both when the car is off. Double check the control wiring. Deep discharges like that will kill a battery so it's being damaged every tI'm it happens. Until you can check for those current leaks, unhook the battery between drives. My wires were switched, charged and worked fine but had a 3 amp draw when the car was off, swapped them everything works great no more draw. Quote Link to comment Share on other sites More sharing options...
DaveT Posted May 11, 2017 Share Posted May 11, 2017 Wow, it's rare for a wiring error to not cause damage, great that it's working now! Quote Link to comment Share on other sites More sharing options...
l75eya Posted May 12, 2017 Share Posted May 12, 2017 See if you can get that alternator checked at a parts store, they'll normally do it for free. IIRC, bad diodes in the regulator/rectifier can drain a battery like that, even if the thing is charging normally while running. I seem to vaguely remember having the same thing happen to me and it turned out that I had connected the two wires in the plug backwards. Try switching them wires. To be clear this is the two in the plug, not the one ring connector that goes on the stud. Quote Link to comment Share on other sites More sharing options...
l75eya Posted May 12, 2017 Share Posted May 12, 2017 Oh, just saw the rest of the thread! Ha! I knew that had happened to me. I was also curious about how it didn't really do anything that adverse except a parasitic draw when I made that same mistake. Quote Link to comment Share on other sites More sharing options...
XHighOctanex Posted May 13, 2017 Share Posted May 13, 2017 Wow, it's rare for a wiring error to not cause damage, great that it's working now! Is it necessary to ground these? It has the spot for a ground wire but I have never grounded an alternator on any of my cars before. Figured they grounded through the mount Quote Link to comment Share on other sites More sharing options...
DaveT Posted May 13, 2017 Share Posted May 13, 2017 Typically, alternators ground through the mounting bolts, etc. Quote Link to comment Share on other sites More sharing options...
nicksubaru Posted May 20, 2017 Share Posted May 20, 2017 Why have i never seen this thread until now? My alt on my ea82 went out not long ago, and i just got a stock one.... What a bummer. It would be nice if someone could really condense some of these mods into a single "locked" thread. If someone already did that. Please point me in the right direction Quote Link to comment Share on other sites More sharing options...
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