Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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Do you have a volt meter? Also, I assume the alternator was bench tested?
It wont charge in the truck cause it can't handle a load. When you bench test the alternator, you are not putting a load on it.
Since you have a volt meter, if you can start the truck and measure voltage directly on the alternator and if it is not charging, then you know its the alternator. If it is a wiring issue, you would still see charging voltage at the alternator cause it is spinning to build current.
It has become ver common for after market alternators not to work right. If you do get one that works, you will be lucky if it lasts a year.
Do you want to check that and get back to me?
No wiring issues. Normally it is just the after market part that is the problem.
Let me know how you make out and if you have any more questions on this tomorrow