Need some quick help plz...

[GTA_V6_Mustang]

Ok well after 4.5 grand rpm the voltmeter on the dash goes past 18 and battery light come on. So I figured, time for a new voltage regulator after 13 years. So I replaced it yesterday and inspected the brushes, still good. And I started it and voltage on the dash was reading better now. I was like ok kewl problem fixed. I reved it and sure enough after 4.5 grand rpm it did it again. Any suggestions? Could the rectifier cause this?

 

[bill302]

when i encounter problems like this i take my car to a reputable alternator rebuild shop in town they have the tools to diagnosis the problem free. also most autoparts stores can test the alternator and charging system...

 

[GTA_V6_Mustang]

I am just going to replace the alternator. I dont have the patience for this, lol.

 

[bill302]

it could be a waste of money....just drive to an autoparts store and tell them to check your charging system...could be bad voltage reg. even if its new,battery or loose connection ect....

 

[GTA_V6_Mustang]

Yea but even if the new one is bad to cause the same exact problem? What are the possibilities of that. At the same exact RPM. Besides I know the alternator passes bench testing. I checked it on a VAT-40 puts out 110 amps max. 14.5 volts. But at 4.5k rpm voltage shoots up.

 

[bill302]

get a new one, but i would ensure if problems still exist that you could return it for a cash refund...i have done this before i ask if i'm not satisfied with the product can i return it for a cash refund if they say yes you have a free diagnosis tool and if it fixes it you bought what you need.