Sr20 low voltage. Tests make no sense - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

mr.nismo. · 06-11-2013, 02:46 AM

Ok I have a blacktop sr20. It has a 6 month old KA alternator. My battery is in the back, it's a big ass Maserati battery. Never had problems with it. I did the sr swap in late December last year. Never had power issues. I have dual FALs. When they're on the car will bog a tiny bit. Tonight when I was coming home from work everything was cool until my fans kicked on. I have a pro sport volt gauge and it read 10.8 ish volts. I turned the headlights off and it was at 11. When the fans stopped it stayed there. I shut the car off and turn it back on. Stays at 11v. At this point my built in power inverter is beeping off the system is below 12v as well. Just with the ignition in the "on" position, my walbro primes at 11.3 ish and then back to 12v when done. When the car runs, it's low 11 (pro sport gauge and power inverter is blaring) however voltage at the battery terminals are 12v and power at the 75amp fuse to ground is 11.85v. Think it's just a bad gauge and inverter connection? Well actually now it always bogs down like when fans are on but worse. I checked ecu ground and gauge grounds and they're fine. So... Any ideas?

91EfSi · 06-11-2013, 03:37 AM

Usually when running you should be at 14ish volts. Never hurt to pull the alternator and have it tested at a parts store.

mr.nismo. · 06-11-2013, 03:39 AM

Fuck. This thing is only 6 months old too. That's shitty

91EfSi · 06-11-2013, 04:24 AM

Should be under warranty still though if you got it from a parts store

mr.nismo. · 06-11-2013, 04:25 AM

Yeah it should be. I'm shipping her to Kentucky in 2 days so I guess this is her way of showing me fuck no lol

91EfSi · 06-11-2013, 04:29 AM

Lol You moving there?

mr.nismo. · 06-11-2013, 04:31 AM

Yeah. My wife is living there and I have my job and everything getting transferred. Shipping all our stuff and the 240 in a couple days. I fly out sunday night. Sooo yeah this is a last minute pain in the ass lol

06-11-2013, 02:46 AM	#1
mr.nismo. Nissanaholic! Join Date: Feb 2012 Location: Oxnard, CA Age: 31 Posts: 1,890 Trader Rating: (31) Feedback Score: 31 reviews	Sr20 low voltage. Tests make no sense Ok I have a blacktop sr20. It has a 6 month old KA alternator. My battery is in the back, it's a big ass Maserati battery. Never had problems with it. I did the sr swap in late December last year. Never had power issues. I have dual FALs. When they're on the car will bog a tiny bit. Tonight when I was coming home from work everything was cool until my fans kicked on. I have a pro sport volt gauge and it read 10.8 ish volts. I turned the headlights off and it was at 11. When the fans stopped it stayed there. I shut the car off and turn it back on. Stays at 11v. At this point my built in power inverter is beeping off the system is below 12v as well. Just with the ignition in the "on" position, my walbro primes at 11.3 ish and then back to 12v when done. When the car runs, it's low 11 (pro sport gauge and power inverter is blaring) however voltage at the battery terminals are 12v and power at the 75amp fuse to ground is 11.85v. Think it's just a bad gauge and inverter connection? Well actually now it always bogs down like when fans are on but worse. I checked ecu ground and gauge grounds and they're fine. So... Any ideas?

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06-11-2013, 03:37 AM	#2
91EfSi Leaky Injector Join Date: Dec 2011 Location: Salina, Kansas Age: 34 Posts: 140 Trader Rating: (4) Feedback Score: 4 reviews	Usually when running you should be at 14ish volts. Never hurt to pull the alternator and have it tested at a parts store.

06-11-2013, 03:39 AM	#3
mr.nismo. Nissanaholic! Join Date: Feb 2012 Location: Oxnard, CA Age: 31 Posts: 1,890 Trader Rating: (31) Feedback Score: 31 reviews	Fuck. This thing is only 6 months old too. That's shitty

06-11-2013, 04:24 AM	#4
91EfSi Leaky Injector Join Date: Dec 2011 Location: Salina, Kansas Age: 34 Posts: 140 Trader Rating: (4) Feedback Score: 4 reviews	Should be under warranty still though if you got it from a parts store

06-11-2013, 04:25 AM	#5
mr.nismo. Nissanaholic! Join Date: Feb 2012 Location: Oxnard, CA Age: 31 Posts: 1,890 Trader Rating: (31) Feedback Score: 31 reviews	Yeah it should be. I'm shipping her to Kentucky in 2 days so I guess this is her way of showing me fuck no lol

06-11-2013, 04:29 AM	#6
91EfSi Leaky Injector Join Date: Dec 2011 Location: Salina, Kansas Age: 34 Posts: 140 Trader Rating: (4) Feedback Score: 4 reviews	Lol You moving there?

06-11-2013, 04:31 AM	#7
mr.nismo. Nissanaholic! Join Date: Feb 2012 Location: Oxnard, CA Age: 31 Posts: 1,890 Trader Rating: (31) Feedback Score: 31 reviews	Yeah. My wife is living there and I have my job and everything getting transferred. Shipping all our stuff and the 240 in a couple days. I fly out sunday night. Sooo yeah this is a last minute pain in the ass lol