overcharging battery/electrical system

TargaMKII · 02-22-2006, 06:11 AM

i have an 1985 supra that likes to charge at about 17 or 18 volts....this continues when i accelerate...but when i press on the brake...use the windows...or shift it goes back to normal...it also charges normal when im at idle...maybe my voltometer is acting up?..but i dont want to take chances..anyone had this problems...and maybe have some possible solutions or maybe things i should check?

suprra_girl · 02-22-2006, 10:08 AM

get your alternator checked.... i believe there is an item called a voltage regulator inside it which has decided to take a dive on you

well try that first anyhow

Freezenpop · 02-23-2006, 01:29 AM

funny, my 83 was doing the exact opposite. It would sit at normal without using electronics, but when i used the power windows or pressed the break or stuck the fog lights on or whatever, it would get down to about 10 or 11 from 13 or so. I just took apart my alternator and replaced the voltage regulator about 2 weeks ago (which seemd to have worked), didn't have it tested though I probably should have. I did wierd stuff when i accelerated into high rpms too but i forgot.

TargaMKII · 02-27-2006, 02:00 AM

ive replaced the alternator 4 times...and nothing still with the same result..so its not that..i dont know maybe any other solutions?

midwestmk2 · 02-27-2006, 07:15 AM

Buy an external voltage regulator and mount it on the fender by the alt and see if that helps..If not then i can just say let a dealer run a diagnostic on the electrical system..

hangsupra · 02-28-2006, 12:04 AM

it use to happen on my other 85 mk2 supra... and i check on the fuse on the fuse box... and it runs a bigger fuse so when you acceleration then the battery went up or goes up... and replace by the stock fuse then it solve the problem.... so try to check on the fuse... and see that helps you.

02-22-2006, 06:11 AM	#1
TargaMKII Stock Join Date: Feb 2006 Posts: 10	overcharging battery/electrical system i have an 1985 supra that likes to charge at about 17 or 18 volts....this continues when i accelerate...but when i press on the brake...use the windows...or shift it goes back to normal...it also charges normal when im at idle...maybe my voltometer is acting up?..but i dont want to take chances..anyone had this problems...and maybe have some possible solutions or maybe things i should check?

02-22-2006, 10:08 AM	#2
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	get your alternator checked.... i believe there is an item called a voltage regulator inside it which has decided to take a dive on you well try that first anyhow __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

02-27-2006, 07:15 AM	#5
midwestmk2 3" Exhaust Join Date: May 2005 Location: STL ,MO. Posts: 206	Buy an external voltage regulator and mount it on the fender by the alt and see if that helps..If not then i can just say let a dealer run a diagnostic on the electrical system.. __________________ 83 p-type,5spd,4;10 gears,New 86 cressida 5MGE 195hp,HKS metal head gasket,Cressida injectors,d-port intake runners,No EGR,No cat,Tweaked MAF,Custom cold air intake,Custom rear strut bar,Perfection clutch,Custom 3inch exhaust,4inch bazooka muffler,,Only 2700lbs,, COME AND GET IT!IF YOU DARE!! Please no Honduuuuhhhs!!! http://www.cardomain.com/ride/858848/2

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Cold Start System Testing (hard starting)	mrnickleye	MKIII Supra	12	11-13-2010 08:32 PM
Questions about the oem fuel system	Magical Trevor	MKIV FAQ	7	08-19-2007 04:40 PM
Exhaust System	SideWinderGX	MKIII Supra	8	02-28-2007 08:01 AM
Cold Air system?	Black'88	Non-Generation Specific Questions	10	04-22-2006 02:40 AM
exhaust system	kewlcoconut	MKIII Supra	10	11-02-2005 07:46 PM

02-23-2006, 01:29 AM	#3
Freezenpop Stock Join Date: Jan 2006 Posts: 24	funny, my 83 was doing the exact opposite. It would sit at normal without using electronics, but when i used the power windows or pressed the break or stuck the fog lights on or whatever, it would get down to about 10 or 11 from 13 or so. I just took apart my alternator and replaced the voltage regulator about 2 weeks ago (which seemd to have worked), didn't have it tested though I probably should have. I did wierd stuff when i accelerated into high rpms too but i forgot.

02-27-2006, 02:00 AM	#4
TargaMKII Stock Join Date: Feb 2006 Posts: 10	ive replaced the alternator 4 times...and nothing still with the same result..so its not that..i dont know maybe any other solutions?

02-28-2006, 12:04 AM	#6
hangsupra 12psi boost Join Date: Jan 2005 Location: 209 area in cali. Posts: 397	it use to happen on my other 85 mk2 supra... and i check on the fuse on the fuse box... and it runs a bigger fuse so when you acceleration then the battery went up or goes up... and replace by the stock fuse then it solve the problem.... so try to check on the fuse... and see that helps you.