Battery overcharging? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Milspec180 · 04-15-2013, 05:41 PM

Ok so I have an sr'd hatch with the 125 amp quest alt upgrade. My battery is relocated to the trunk with 2ot copper cable. The car is also stripped with no stereo, a/c, or power anything(so no load is applied except for essentials). When I start the car and remove the positive terminal from that batt it stays running and gives me 15.7 volts dc at idle. Is it possible to run too much to the battery and over charge it? Or can I just run a stronger batt that can handle the juice?
Thanks for the help.

shanelach · 04-15-2013, 07:20 PM

You can overcharge. Sometimes the diodes in the alt fry and allow too much voltage to go to the battery.

*fliprayzin240sx* · 04-15-2013, 08:41 PM

Double check your connection into the alternator. The 2 pin plug into the alternator is used as a reference for the alternator to regulate the voltage. If its not seeing the voltage in to itself, itll push over over 14-15 V. You'll start frying shit in the car if you are over charging. I've had somebody blow a battery for an example, literally explode while he was driving.

shanelach · 04-15-2013, 08:57 PM

Yeah I've had one at work come in. The alternator was charging at 18v and the battery was about to explodes. Couldn't even touch it and the sulfur smell had everyone almost puking.

gotta240 · 04-22-2013, 11:19 PM

Milspec= Clear your inbox, then message me.

And yes, very possible to overcharge, resulting in expensive problems.

04-15-2013, 05:41 PM	#1
Milspec180 Zilvia Member Join Date: Feb 2013 Location: Portlandia Age: 35 Posts: 231 Trader Rating: (0) Feedback Score: 0 reviews	Battery overcharging? Ok so I have an sr'd hatch with the 125 amp quest alt upgrade. My battery is relocated to the trunk with 2ot copper cable. The car is also stripped with no stereo, a/c, or power anything(so no load is applied except for essentials). When I start the car and remove the positive terminal from that batt it stays running and gives me 15.7 volts dc at idle. Is it possible to run too much to the battery and over charge it? Or can I just run a stronger batt that can handle the juice? Thanks for the help.

04-15-2013, 07:20 PM	#2
shanelach Zilvia Member Join Date: Jun 2008 Location: Dracut, MA Posts: 257 Trader Rating: (1) Feedback Score: 1 reviews	You can overcharge. Sometimes the diodes in the alt fry and allow too much voltage to go to the battery. __________________ http://bosstownfr.blogspot.com/

04-15-2013, 08:41 PM	#3
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	Double check your connection into the alternator. The 2 pin plug into the alternator is used as a reference for the alternator to regulate the voltage. If its not seeing the voltage in to itself, itll push over over 14-15 V. You'll start frying shit in the car if you are over charging. I've had somebody blow a battery for an example, literally explode while he was driving. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

04-15-2013, 08:57 PM	#4
shanelach Zilvia Member Join Date: Jun 2008 Location: Dracut, MA Posts: 257 Trader Rating: (1) Feedback Score: 1 reviews	Yeah I've had one at work come in. The alternator was charging at 18v and the battery was about to explodes. Couldn't even touch it and the sulfur smell had everyone almost puking. __________________ http://bosstownfr.blogspot.com/

04-22-2013, 11:19 PM	#5
gotta240 Post Whore! Join Date: Dec 2005 Location: so cal Posts: 3,496 Trader Rating: (21) Feedback Score: 21 reviews	Milspec= Clear your inbox, then message me. And yes, very possible to overcharge, resulting in expensive problems.