ok a few weeks ago had charging issue.. replaced alternator, still same problem.. replace voltage regulator pre 70 mopar racing style.. the regulator fixed the issue but now i think its a little to high 15.4 to 16.1. strictly race car here. is it to high and if it is how do i lower to get around 14. thanks

Is this charging voltage or battery voltage? It's slightly high @ 16.1, but I wouldn't be concerned unless the battery is overcharged when a voltage reading is taken w/ the engine off.

what was the charging problem that led to your changing the alternator? on the older system they controlled the 12+ to the field, on the newer one they control the ground. full battery voltage to the field on the older one gives full alternator output, complete ground on the newer style gives full alternator output.

Make sure the regulator has a good ground. On the old type where it controls the 12 volt feed it has to have a good ground to work the windings inside so it can put voltage through the resister circuits and control output. On the newer style where it controls the ground I have seen the conector have the battery wire break inside the conector. The ground was still good to ground the field but the other terminal which sences battery volts lost the conection which causes an overcharge since the regulator cant sence what the battery volts is. Ron

Yep, measure the voltage between the + terminal at the battery, and the voltage on the blue sense wire at the alternator. I'd bet you'll see ~2v there.

(+ Dmm lead on the battery +, and the - DMM lead on the blue sense wire).

If so, you have enough bad connections between the battery and the alternator that it's dropping that much voltage, and making the alt overcharge by that amount.

Thanks ill check that stuff out. originally i had 12.2 with a full charged battery while car was running.. alt showed 11.9.. so thats why i got the alternator. i ground of the blue paint on the regulator so that ground should be good. the volts were measured at the battery while car was running. 15.5 to 16

Is this a race car or street car. The race regulator are for a race car and may be set up to over charge a street car

its a race car. no street use at all.

The race regulator is suppose to maintain 13.5 volts...
I think you have problems ... 16 volts is too high
for a stock type system(non 16v system).. better check
the signal/trigger wire for proper voltage... I
wouldnt even mind 14.5 volts but 16 is getting way
to high for that system... have you brought up the
revs to about 4000 rpm to see what it is there

When doing an isolation test a factory system will go to 15.7-15.8. Granted, it shouldn't stay there forever. If it does, there is a problem.

Joel
I think if you will check, the voltage regulator you put on is a race only unit that is designed to maintain max charging at all RPM's. I used one of those on my 68 Hemi car when I raced it. You can do a couple of things to reduce your voltage if you are going to use that race style regulator. Put a larger pulley on the alternator to reduce the alternator RPM's and the output. Adjust the belt so it slips a little (not my favorite, but it will work)
IF you still have too much Voltage, then you may have to get away from the race regulator and just put in a heavy duty regulator for a truck that has all of the extra lights and power take offs.

Is that the old mech regulator?
That one is adjustable.
If its not i suggest you check for voltage drop through both wires to the newer elec regulator.