Alternator Problems

[NSXCessive]

I'm having a low voltage problem with my alternator. My battery light hasn't come on yet, but when first staring the car cold start, it doesn't jump past 12.5Volts on the gage like it use to. When the engine warms its just below 12V mark like 11.8~11.9V.

I'm going to check the charging system against the shop manual to see if indeed that is the problem. I replaced my battery less a year with a new Optimal yellow top. I think the battery is keeping my battery light from going on it been one amazing battery. The alternator hasn't failed yet, but I'm sure its just a matter of time now. Hopefully I have some time to get it fixed.

Here are Some Questions I'm trying to answer:
I heard some rumors that the alternator is same as an alternator in a V6 Accord or Legend?
Has anyone rebuilt the alternator?
Is there a kit avail from Acura?
Would it be eaiser to just buy a new one or try to get my old one rebuilt?
Any tips or suggestions?

Thanks,

 

[pt91]

This is how I would deal with it:

http://www.scienceofspeed.com/products/engine_performance_products/NSX/Cantrell_Concepts/alternator/

 

[hlweyl]

I would assume that the gauge is wrong. When the alternator goes, the battery soon follows. At this point I would check the voltage with a voltmeter rather than the gauge.

good luck

 

[Larry Bastanza]

you should use a DVM on the battery terminals. Check voltage with the engine off. With the engine running you should expect 1-1.5 volts more to charge the battery. If it is not higher, check the belt for proper adjustment, check the battery terminals and alternator terminal for good clean connections. If still NG, remove it and take it to an auto electrical shop for bench testing. If bad, have then fix it. I would expect about $100 for a fix(maybe less), if you bring it to them off the car.

HTH,
LarryB

 

[4AU4LIFE]

I recently had my voltage regulator fail on me also. I called Acura and the regualtor was/is on national back order.
Long story short, had it replaced by local rebuilder for $25 including labor. Got it back the next day, tested, shrink wrapped, and a 1yr warranty!!

 

[NSXCessive]

I checked the charging system according to section 23-99 in the service manual. My gage is bad misreading the voltage by 1~2volts. I measured the voltage at the battery engine off 12.6 off the new optima battery, with the car running its 13.5v~14.2v and higher at inital startup engine. I also noticed it seems the my gage is stuck at 11.5~12v. I'll look into replacing when I change my cluster rings.

Thanks,
Rich