PLEASE HELP! voltage not being regulated? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

bees · 04-22-2010, 10:48 PM

im currently having a bit of an issue with my electrical system. my headlights have been blowing pretty often. after attempting to diagnose it, i noticed that i was getting a high voltage output (15-16v). took the alternator in and it checked fine (~14.21 @ ~5k rpm). are there any other devices/places on the vehicle that would regulate the voltage? i dont understand how the voltage could jump from what it was putting out during the test to what it puts out while operating on my car. any help is appreciated. thanks

bees · 04-23-2010, 12:30 PM

did another check this morning after reinstalling the alternator. 17.53v with engine running and 14.85v with engine not running. could it be my battery?

EDT007 · 04-23-2010, 12:53 PM

It's the alternator, swap it out. I had similar issues.

greenman100 · 04-24-2010, 08:29 PM

Quote:

Originally Posted by bees

did another check this morning after reinstalling the alternator. 17.53v with engine running and 14.85v with engine not running. could it be my battery?

No, its your voltmeter. No battery will ever produce 14.85v engine off. Period.

negrosx13 · 04-24-2010, 11:16 PM

dude at 17v...you're luck that battery pop in your face

04-22-2010, 10:48 PM	#1
bees Zilvia Member Join Date: Oct 2006 Location: socal Posts: 225 Trader Rating: (8) Feedback Score: 8 reviews	PLEASE HELP! voltage not being regulated? im currently having a bit of an issue with my electrical system. my headlights have been blowing pretty often. after attempting to diagnose it, i noticed that i was getting a high voltage output (15-16v). took the alternator in and it checked fine (~14.21 @ ~5k rpm). are there any other devices/places on the vehicle that would regulate the voltage? i dont understand how the voltage could jump from what it was putting out during the test to what it puts out while operating on my car. any help is appreciated. thanks Last edited by bees; 04-23-2010 at 12:32 PM..

04-24-2010, 11:16 PM	#5
negrosx13 Zilvia Addict Join Date: Feb 2009 Location: Houston,tx Posts: 948 Trader Rating: (14) Feedback Score: 14 reviews	dude at 17v...you're luck that battery pop in your face __________________ MORE BACON STRIPS

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04-23-2010, 12:30 PM	#2
bees Zilvia Member Join Date: Oct 2006 Location: socal Posts: 225 Trader Rating: (8) Feedback Score: 8 reviews	did another check this morning after reinstalling the alternator. 17.53v with engine running and 14.85v with engine not running. could it be my battery?

04-23-2010, 12:53 PM	#3
EDT007 Zilvia Addict Join Date: Feb 2008 Location: NJ Age: 42 Posts: 617 Trader Rating: (8) Feedback Score: 8 reviews	It's the alternator, swap it out. I had similar issues.