alternator charging too much. can it blow fuses? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

ROTTEN EGG · 06-02-2007, 02:58 AM

having a few electrical problems soon after changing the alternator. checked it and the alternator seems to be overcharging. battery is completely full. will it be enough to blow a fuse?

problems since changing the alternator.
brake light fuse (15a) blows everytime i brake. couldnt find a short.
shifter release relay burnt out
horn relay heats up.
and tranny wont shift past 2nd. Maybe the TCU or totally unrelated.

will loosen up the tension on the belt tomorrow and see if it helps. let me know what you guys think.

ssublime1 · 06-02-2007, 03:11 AM

The voltage regulator is probably bad or going bad. Has any oil gotten in the alternator? Replacing it is going to be the easiest fix. It will fuck your shit up if you leave it like that.

ROTTEN EGG · 06-02-2007, 06:27 AM

alternator and battery are brand new. Can the problem be with the wiring? I rewired the positive from the alternator straight to the battery.

g6civcx · 06-02-2007, 08:20 AM

Quote:

Originally Posted by ROTTEN EGG

Can the problem be with the wiring? I rewired the positive from the alternator straight to the battery.

Maybe.

Just because a part is new doesn't mean it's good, especially the battery. Chances are the battery has been sitting on a shelf for months.

You need to test them.

gotta240 · 06-02-2007, 08:24 AM

go buy a 5 dollar voltage tester.

G-spec · 06-02-2007, 09:22 AM

I argree with the other poster on the voltage regulator being toast (if it is in fact putting out 15+ volts) however the increased voltage by itself wont blow fuses. Fuses blow due to excess amperage being pulled across the fuse. I'd check for a loose ground on your taillight harness. Relays heating up would be right in line with an overcharging battery, and power spikes going into the ecu could easily burn it up. I recommend not driving it any more untill your able to check the actual voltage at the battery while idling, and with a couple quick revs.

chmercer · 06-02-2007, 11:00 AM

when my alternator was going bad it would make like 18 volts if you revved the motor too much. all my lights and safc display and shit would get really bright. never blew anything up but i only drove it like that for 2 days

ROTTEN EGG · 06-02-2007, 02:32 PM

ill put them on the machine at work and see what it says. thanks for the info.

06-02-2007, 02:58 AM	#1
ROTTEN EGG Leaky Injector Join Date: Mar 2007 Location: SF Bay Posts: 110 Trader Rating: (0) Feedback Score: 0 reviews	alternator charging too much. can it blow fuses? having a few electrical problems soon after changing the alternator. checked it and the alternator seems to be overcharging. battery is completely full. will it be enough to blow a fuse? problems since changing the alternator. brake light fuse (15a) blows everytime i brake. couldnt find a short. shifter release relay burnt out horn relay heats up. and tranny wont shift past 2nd. Maybe the TCU or totally unrelated. will loosen up the tension on the belt tomorrow and see if it helps. let me know what you guys think.

06-02-2007, 09:22 AM	#6
G-spec Leaky Injector Join Date: May 2007 Location: Rock Hill, SC Age: 47 Posts: 146 Trader Rating: (0) Feedback Score: 0 reviews	I argree with the other poster on the voltage regulator being toast (if it is in fact putting out 15+ volts) however the increased voltage by itself wont blow fuses. Fuses blow due to excess amperage being pulled across the fuse. I'd check for a loose ground on your taillight harness. Relays heating up would be right in line with an overcharging battery, and power spikes going into the ecu could easily burn it up. I recommend not driving it any more untill your able to check the actual voltage at the battery while idling, and with a couple quick revs. __________________ GT3076r-boosted blacktop sr20det, s13 coupe Function over Form...

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06-02-2007, 03:11 AM	#2
ssublime1 Join Date: Mar 2006 Location: Japan Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	The voltage regulator is probably bad or going bad. Has any oil gotten in the alternator? Replacing it is going to be the easiest fix. It will fuck your shit up if you leave it like that.

06-02-2007, 06:27 AM	#3
ROTTEN EGG Leaky Injector Join Date: Mar 2007 Location: SF Bay Posts: 110 Trader Rating: (0) Feedback Score: 0 reviews	alternator and battery are brand new. Can the problem be with the wiring? I rewired the positive from the alternator straight to the battery.

06-02-2007, 08:24 AM	#5
gotta240 Post Whore! Join Date: Dec 2005 Location: so cal Posts: 3,496 Trader Rating: (21) Feedback Score: 21 reviews	go buy a 5 dollar voltage tester.

06-02-2007, 11:00 AM	#7
chmercer BANNED Join Date: Jun 2003 Location: texas! Age: 39 Posts: 3,288 Trader Rating: (0) Feedback Score: 0 reviews	when my alternator was going bad it would make like 18 volts if you revved the motor too much. all my lights and safc display and shit would get really bright. never blew anything up but i only drove it like that for 2 days

06-02-2007, 02:32 PM	#8
ROTTEN EGG Leaky Injector Join Date: Mar 2007 Location: SF Bay Posts: 110 Trader Rating: (0) Feedback Score: 0 reviews	ill put them on the machine at work and see what it says. thanks for the info.