1991 Nissan 300zx not charging

[300zxNA1991]

my 91 300zx alternator does not charge battery so i replaced both(battery and alter.) with new ones just to be safe. But same problem, only runs on what the battery has until it dies. Any ideas in what the problem might be??

[aroche25]

How is the alternator belt? It is tensioned properly? is it too worn to grab? I did the same thing about a year ago except I replaced the alternator twice and got a new battery before I realized it was the alternator belt that has just become so worn it was charging anything.

[300zxNA1991]

How is the alternator belt? It is tensioned properly? is it too worn to grab? I did the same thing about a year ago except I replaced the alternator twice and got a new battery before I realized it was the alternator belt that has just become so worn it was charging anything.

Alternator belt is band new, and it has been properly tensioned, i made sure everything has been done correctly but its still not charging

[marty1mc]

Make sure your connections to the alternator are connected and tight. If you forgot to plug in the connector, you would have the exact situation you have explained.

Next, where did you get your alternator? Autozone and Advance house brand alternators (worldwide mfg), are notorious for failure. You may want to have it tested.

Measure your voltage across the battery at 1500 rpm. If it isn't above 13.2v, you aren't charging properly. If it is, then turn on all of your accessories (lights, heater fan, radio, etc.) and measure again at 1500 rpm. It should stay at or above 13.2 v.

[300zxNA1991]

Make sure your connections to the alternator are connected and tight. If you forgot to plug in the connector, you would have the exact situation you have explained.

Next, where did you get your alternator? Autozone and Advance house brand alternators (worldwide mfg), are notorious for failure. You may want to have it tested.

Measure your voltage across the battery at 1500 rpm. If it isn't above 13.2v, you aren't charging properly. If it is, then turn on all of your accessories (lights, heater fan, radio, etc.) and measure again at 1500 rpm. It should stay at or above 13.2 v.

Yes I have made sure every thing is connected correctly several times, and still not charging right. My alternator is a nissan reman from courtesyparts.com (which they have a location near me), and had it checked and replaced twice just to be safe. But it still doesn't charge the battery. Is their any other connector or fuse else where that could be bad and not let the alternator charge?

[marty1mc]

Here is the wiring diagram. There is a 10A fuse in the circuit, fuse #10 (shown on diagram). Check that, if it's good, then check for +12v on the w/r wire on the plug connector. If it has +12v, then check ground. I would expect either the fuse is missing/blown or you have pushed a pin out somewhere when trying to connect everything.

http://www.300zx.co.uk/cgi-bin/manual.c ... &total=133