Overcharging Please Help

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siuauto

siuauto

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Hey everyone, I have a 71 duster with a 3 wire alt two field and one B+. and electronic reg. When I start the car it is sitting at 16v and when I rev it up it goes to 18 volts and the headlights start to flash. The alt is new and I also took one of my suberbee and tried that with no luck. The reg has been replaced twice because I thought that was the problem the entire time. I checked for volts on the field circuit and I am getting 12.5 volts (KOEO) to the blue wire on the alt. I disconnected the green wire that goes from the alt to the reg and checked continuity to ground (assuming I had a shord to ground) and I have no continuity, I have also ran a new green wire just to be sure from the alt to the reg and no luck. Please help me, have anyone seen this before? I dont think I have any bad grounds but that is where I am going to look next. Can bad grounds cause overcharging? I would think it would cause it not to charge. I have a big cruis night tomorrow and I want to get it fixed tonight.
 
do you have a 4 pin ballast resistor? on my scamp, the blue field wire runs from the alt. to the resistor, maybe that side is blown? not sure if this would cause it. good luck.
 

No idea what (KOEO) means???

Be very sure the voltage regulator has a good ground to the chassis and the engine!

Does it quit charging when you unplug the green field wire at the alt.?

Also what are the readings when it's running and charging at:

The battery? The blue field wire? and the blue wire going into the regulator (which in reality is the same wire as the alternator field wire)?
 
nothingbutdarts said:
No idea what (KOEO) means???

Be very sure the voltage regulator has a good ground to the chassis and the engine!

Does it quit charging when you unplug the green field wire at the alt.?

Also what are the readings when it's running and charging at:

The battery? The blue field wire? and the blue wire going into the regulator (which in reality is the same wire as the alternator field wire)?
Click to expand...

KOEO=key on,engine off
 
Thank you all for your help. I have identifies the problem. I have high resistance on the B+ wire after the wire goes into the bulkhead. The sensing wire was only reading 14.2 volts while the alt is putting out 16 volts. Thank you all for your help.
 
siuauto said:
Thank you all for your help. I have identifies the problem. I have high resistance on the B+ wire after the wire goes into the bulkhead. The sensing wire was only reading 14.2 volts while the alt is putting out 16 volts. Thank you all for your help.
Click to expand...


Great Job!
 
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