in your opinion rb25 100amp fuse problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Silviaoneday · 09-12-2009, 06:19 PM

Hey guys,

Well I have a s14 with an rb25, I recently installed a new timing belt, exhaust manifold gasket, and a t3 flange gasket. I had the alternator polished now I have a PROBLEM, the car will not make it down the street without blowing the 100 amp main fuse. Ive replaced the fuse 3 times today, checked the wires going to the back of the alternator and made sure they werent grounding.... Other then the timing belt being a little tight I'm lost... Any ideas!!

All that I have touched:

1. Cam angle sensor/ but you cant screw plugging it in up
2. Turbo/ self explanitory
3. Alternator,??

THANKS!!

bardabe · 09-12-2009, 07:29 PM

the alternator is over charging and blowing out the fuse.

Silviaoneday · 09-12-2009, 07:54 PM

Yea I had the guy polish the alternator who knows what the hell he did, how do I fix this?

projectRDM · 09-13-2009, 09:10 AM

Is the plastic insulator on the charging stud cracked or damaged? That would be the first thing to check, if it's fine then he did some kind of damage when polishing it. It's not overcharging though, that would mean the voltage regulator is bad and you'd see increased voltage, not amperage. Something is grounding out, maybe a winding got some grit on it and when it expands from the heat it's touching the case or something similar.

Silviaoneday · 09-13-2009, 10:37 AM

Well the insulator was cracked but was on there still. I took it off and glued it back together, could that still be a problem? Other then that there is some shit all over the winding as you say from the polish, that could be an issue... The car starts up fine you can turn it on and off, but when you go and drive it and put any form of a power load on it, it will blow the fuse. Im going to get the alternator tested now and see what it puts out. Just to make sure there is the power terminal and one ground wire that plugs in and the pigtail plug on the right side of the alt ( under the vehilce looking forward)??

THANKS GUYS

Quote:

Originally Posted by projectRDM

Is the plastic insulator on the charging stud cracked or damaged? That would be the first thing to check, if it's fine then he did some kind of damage when polishing it. It's not overcharging though, that would mean the voltage regulator is bad and you'd see increased voltage, not amperage. Something is grounding out, maybe a winding got some grit on it and when it expands from the heat it's touching the case or something similar.

*fliprayzin240sx* · 09-13-2009, 11:12 PM

Get another alternator, Im willing to bet your alternator is fubar'd and grounding out.

Silviaoneday · 09-14-2009, 12:38 PM

Well I took the alternator and got it tested, it passed with flying colors...

09-12-2009, 06:19 PM	#1
Silviaoneday Zilvia Junkie Join Date: Dec 2007 Location: So Cal Posts: 472 Trader Rating: (9) Feedback Score: 9 reviews	in your opinion rb25 100amp fuse problem Hey guys, Well I have a s14 with an rb25, I recently installed a new timing belt, exhaust manifold gasket, and a t3 flange gasket. I had the alternator polished now I have a PROBLEM, the car will not make it down the street without blowing the 100 amp main fuse. Ive replaced the fuse 3 times today, checked the wires going to the back of the alternator and made sure they werent grounding.... Other then the timing belt being a little tight I'm lost... Any ideas!! All that I have touched: 1. Cam angle sensor/ but you cant screw plugging it in up 2. Turbo/ self explanitory 3. Alternator,?? THANKS!!

09-12-2009, 07:29 PM	#2
bardabe Post Whore! Join Date: Aug 2005 Location: SoCal Age: 35 Posts: 4,719 Trader Rating: (10) Rides Gallery: bardabe Feedback Score: 10 reviews	the alternator is over charging and blowing out the fuse. __________________ Review Thread

09-13-2009, 09:10 AM	#4
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	Is the plastic insulator on the charging stud cracked or damaged? That would be the first thing to check, if it's fine then he did some kind of damage when polishing it. It's not overcharging though, that would mean the voltage regulator is bad and you'd see increased voltage, not amperage. Something is grounding out, maybe a winding got some grit on it and when it expands from the heat it's touching the case or something similar. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

09-13-2009, 11:12 PM	#6
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Get another alternator, Im willing to bet your alternator is fubar'd and grounding out. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

09-12-2009, 07:54 PM	#3
Silviaoneday Zilvia Junkie Join Date: Dec 2007 Location: So Cal Posts: 472 Trader Rating: (9) Feedback Score: 9 reviews	Yea I had the guy polish the alternator who knows what the hell he did, how do I fix this?

09-14-2009, 12:38 PM	#7
Silviaoneday Zilvia Junkie Join Date: Dec 2007 Location: So Cal Posts: 472 Trader Rating: (9) Feedback Score: 9 reviews	Well I took the alternator and got it tested, it passed with flying colors...