Hey All, jst a question about  wiring in the zx alternator upgrade. Have installed the alternator and adaptor from Dave, the car is charging but the Amp gauge fluctuates wildly when car is running. Does this look like the correct wiring for the alternator. Car is a 12/70 240Z.

Going out to change the oil, thanks in advance for any input!

Mark

I would spin that batt connection (A) around 180degrees, it looks dangerously close to grounding out to the center of the alt.

Thanks Dave, will do.otherwise looks correct?

Woops! posted the wrong picture! Standby!

Did this alternator come with an internal or external voltage regulator? The conversion is for the purpose of eliminating the external regulator. So if you haven't disconnected the external regulator it may cause an erratic response inside the car on the guage.

Sorry, here is the correct photo! I know one wire is not secured with a nut .

Yes the ZX adapter plug is installed and external regulator removed

Ok. Test it

 This is how I've had it wired . The gauge fluctuates. I am tightening the belt as it seems too loose. Is there another way to wire this? 

Well..... i got my son to tighten the bolt on the alternator while i pried on it to hold it in position. That seems to have done it! the gauge is behaving normally now, apparently a slipping belt will cause the gauge to fluctuate? Seems to idle better too! Going for a test drive!

Spoke to soon, test drive revealed the gauge behaving normally for a while, then fluctuating wildly again.I'm thinking that if the belt has been slipping for a while, it is worn and now slipping all the time. Does anyone  agree that a  slipping belt will cause fluctuations in the Amp gauge? Time for the MSA alt. adj arm and a new belt I think.

Did you have any issues with the ammeter before you made the swap? I'm leaning towards a loose ground somewhere but if you didn't touch anything else all you can do is back track or shoot ZsOndabrain a quick inquiry. You should be able to sort it. Check in the trouble shooting section of the Haynes Manual also to see what would cause an erratic guage. It will probably point you right the issue.

5 hours ago, northernz said:

Sorry, here is the correct photo! I know one wire is not secured with a nut .

Not clear that you put a nut on that eyelet and tightened it.  Is that picture a representation, or your actual alternator?  Where's the picture of the adapter plugged in?

A loose belt usually just makes noise.  I would disagree that it causes erratic charging. (Edit - changing my vote to Maybe).

Edited June 27, 20177 yr by Zed Head