InitialD

Ive been having some Alternator issues recently. The car had a 70amp Alternator that was tested by a AutoElec and the alternator was fine. The problem was that when you have your headlights on, brake, and indicators, the charging rate goes from just above 14v to 11v??!! also if you have the stereo on, the charging rate goes from just above 14 down to 12v. I assumed it was something todo with the Amps and Stereo so i dissconnected them. It was still dropping from above 14v to 13v when you have the indicator on and brake but no headlights.

So i got my hands on a 85amp Alternator in good nic, fitted that, and it still drops the same, but now when the headlights are on if you use the indicator or brakes, it drops to 11v!!!


Im stumped! Whats going on? Ive considered going to a auto elec but they seem to charge $70 and all i get told is what i think it is (its happened recently with the dizzy).

InitialD

Ok, i checked all connections today and came up with this

Indicators + brakes = Slight Drop nothing tooo bad
Inicators + brakes + Stereo (2amps) = Same as above

As soon as i turn my headlights on, no matter what i do it drops.
Also it starts to charge at 14.8v when the car is first on and drop to 14v after 5mins

__________________

1991 Ford Falcon EA 30th Anniversary

psycho chicken

Where are you measuring the out put? The battery terminal or the alternator?

InitialD

on the dash cluster?

__________________

1991 Ford Falcon EA 30th Anniversary

psycho chicken

What, off the guage?

That's not much good, get out the multimeter and check it at the alternator (it'll be a bit of a reach) and at the battery terminal. My guess is you've got fairly high resistance in the battery leads. That or a problem with the alternator itself, but seems you changed them over I doubt it.