So, earlier this year I replaced my alternator and diode from the Z store ( 240z Alternator Upgrade with internal voltage regulator)

I have been driving it on and off all summer and fall. Today I took the car for a drive in a light rain, with the wipers and headlights on and made a couple stops in town, started no issues. Drove home about 20 miles and got to my driveway and turned off the car so I could put it in the garage, but left the lights on. Went inside and grabbed a set of keys, came out and the car would not start. I had to jump it..... I did noticed the blinkers were slow when I was coming home,,,,,,, The AGM battery tested fine a few months ago and it's "sits" with a trickle charger on it....... Thinking the Alternator might of went? Battery went bad ( it is 3 years old)? Before I dive into it, I thought I would ask for advice..... It seems odd that the rebuilt alternator from the z store would have gone bad? Before I pull it and have it tested, has anyone had issues with rebuilt alternators?

Any advice is appreciated.......

Edited 13 hours ago13 hr by 70z4fun

Everyone on this forum I believe has had issues with rebuilt alternators and starters. Take it to the parts store and have it checked out.

Good opportunity to learn how to use a multimeter. Check voltage at idle and while raising RPM. Some of the conversion plugs from MSA have been known to melt and fail.

You can get a cheap meter for cheap at a place like Harbor Freight.

https://www.harborfreight.com/7-Function-Digital-Multimeter-59434.html

Here's an old thread about a similar problem.

(Edit - man, I wrote a lot of stuff back then.)

Edited 1 hour ago1 hr by Zed Head

Agree with Yarb on rebuilt alternators. I make the store test them before I buy one. Been burnt before with a bad one, literally. Popped all my fuses as soon as I cranked the car.

If you have a volt meter or can borrow one, check the fully charged battery without the trickle charger. Mine usually reads about 12.5 volts. Then crank the car and see what the alternator is adding, should go up to 13.5-ish. Check the alternator belt to make sure it's good and tight. I always use a broom stick or similar as a pry bar to get mine tight.