Still overcharging

[Bee383]

About had enough of the elec issues.my charging system is overcharging the battery.i bypassed the ammeter,followed the mad electric upgrade to the letter.new harness for elec ign.flat regulator dual field alt.i have grounded reg with a separate strap to block.and just can't see where I've gone wrong.battery voltage with meter at about 2000 rpm comes up over 17.i haven't found any voltage drops.tried 3 regulators all same.thanks for any ideas you might have

 

[RustyRatRod]

Just for kicks, try another battery.

 

[Bee383]

I think I will try that.i really think this car has been doing this since I bought it last year.just not much of an elec guy.back at it i guess

 

[RustyRatRod]

Well, if the battery is weak, it could still start the car, but it's weakness or inability to accept a full charge would have the charging system working overtime. It's just a guess. You seem to have covered everything else. Good luck.

 

[wannadrag]

Just for kicks, try another battery.

Or for giggles another meter.

 

[Bee383]

Tried another battery same problem.anybody know if I should have battery voltage at both the blue and green field wires at alternator with motor off and key in run position?

 

[bm02tj]

Are you testing voltage at battery or at alternator
also if you have a bad connection going to the regulator it thinks the voltage is low and will try to raise it

 

[Bee383]

I have measured both 16-18 volts depending on rpm.i just measured and found a large voltage drop from blue input on vr to battery + over 6 volts with engine running.i assume that means i have a connection problem on that side of circuit?

 

[SwedCharger67]

I can't comment on the blue input to the voltage regulator (VR), but generally speaking:

If the VR for some reason senses a low voltage, it will strive to increase the field current. The increased field current vill increase the alternator output. I would check that the connections on the field terminals are correct, and make sure the VR is the correct type for a 2 terminal field winding.

On a fully charged battery you should never have more than 14.4 Volts charging voltage (an empty, or low, battery can have more without problems). Over that 14.4 voltage and the lead-acid battery start gassing, which can be dangerous (highly explosive gas with the right air mixture).