1909miata

New bosch alt, new bat, the problem started today. I am getting irregular voltages between 11.9-14.4 at idle. Everything has .1-0 ohms resistance. The only wire I haven't tested is the B+ rez from alt to bat but I don't have leads ong enough. Has anoyone has these problems? I just did stage 3 clutch and vlsd conv. Perhaps I pinched a lead when pulling the dt out. What is the ground that attaches to the brace between the trans and dif for? I am at a loss, this is my third alt in the past couple of months new belt and its tight. However the charge like is ver dim thanks -lane

Braineack

iTrader: (62)

bad alternator. was it refurbished?

1909miata

Its a brand new one. I think I have high resistance in the b+ line from the bat to alt resulting in low output voltage.

Braineack

iTrader: (62)

or the voltage regulator built into the alternator is bad.

the ground on the PPF, is just another battery ground...it's still there right?

Use can use a jumper cable to go back to the battery, or test at the MAIN fuse. that goes directly back to the battery terminal.

soviet

iTrader: (10)

Also check if the connectors on the alternator are tight. I had those issues with loose connectors.

MartinezA92

iTrader: (4)

If you had high resistance on the wire from the alt to the battery, I have a feeling you'd see low charging voltage all the time...worth a check I guess. Where did you get the alternator? Its completely possible you got a broken one.

Braineack

iTrader: (62)

Id suspect a NEW NEW one to cost $300. My refurbished unit bought "new" at advance auto parts cost $80.


I'd also looking at the power wire on the starter. that would have been removed during the clutch job.