over charging!!! id my altinator?

[1jzracing]

my battery voltage as read from the ecu is constantly about 15.2 - 15.8v when the engine is running is this considered too much???

its a small internal regulated altinator from a toyota of some sort ... dont know what its off, got it from a wrecker its late model multi-V belt etc its very small and compact in size hence my purchase for racing

anyone know what might be the corect wiring so i can varify my conections??
it has a row of 4 pins in a long thin oval plug

very hard to picture... nearly imposable to see buried under all sorts of stuff in my eng bay

[slide86]

that is definetly too much. it should only be between 13.8 and 14.4.

id say that you have an internal fault in the alternator. best to replace the entire unit rather than pulling it apart to try and find the cause of the problem.

hopefully there are some markings on it like a part number, so you can match it up to a new or second hand one

[love ke70]

but is it blowing anything?
that sort of voltage you should still be safe with
many are regulated at ~15.1 amps these days

[mrshin]

Is the 'sense' wire connected to someplace really crap and giving a false reading to the alternator?

[oldcorollas]

http://autoshop101.com/forms/h8.pdf

hope this helps

[slide86]

but is it blowing anything?
that sort of voltage you should still be safe with
many are regulated at ~15.1 amps these days

what vehicles are running that kinda voltage? i know for a fact that if any holden product had that kinda reading it would be getting a new alternator straight away. anything over 14.6v is sus for us......

[love ke70]

my ke 70 is regd to 14.9 i think and newer cars are reged over 15 im quite sure

[oldcorollas]

somethign wrogn with your KE70

the Bosch regs are 13.9-14.2 or 14.3....

[slide86]

well my work bay is next to the auto elecs work bay and i have to listen to his mumbo jumbo all day. VT VX VY VZ (all late model cars) are rated at 14.4volts and thats it.

there is something not right in your system. i havent seen a car in at work yet that has got to 15v WITHOUT a fault in it......

[1jzracing]

cheers guys

thats the sort of info im looking for.. it certianly looks like the small camry high power unit im using

pretty sure my wiring is essentially like the link from oldcorollas, i know there were a couple extra wires i just had to conect ignition to or something ... it was about 4 years ago when i built the loom

all my wiring is pretty well direct and minimal as its a race car so there is no crap at all... still hasnt blown anything but sounds like i might have to pull it off and get to an auto electrix or something - must be a bit tough on things like pumps, injectors and ecu etc

[love ke70]

oh shit, my bad, got my 14's and 15's mixed up lol
disregard everything i said *shamed*
if you get the alternator out and theres a p/n on it i can check wat its from if you like

[1jzracing]

cheers ke70 i might do that for future reference would be handy to know what its off

i might have narrowed the problem a little ... thanks for that info Stew

it could be that i have the 'S' signal wire hooked in somewhere in the ignition circuit where the voltage isnt too strong instead of going right to the battery cable. so the altinator thinks the battery is always weak and is trying to compensate by upping the voltage untill its acceptable at the point where ever that 'S' wire is conecte. battery is in the boot too which probably doesnt help

mmm ...time to shift that little signal wire to the point where the 'B' charge wire jouns the battery lead i think

... hahaha.... cheers Mrshin ... wasnt till anylised the whole operation that i realised you said exactly that!

[Mos]

my battery voltage as read from the ecu is constantly about 15.2 - 15.8v when the engine is running is this considered too much???

Aside from the sense connection already mentioned, have you confirmed this voltage with a known good multimeter? (The sense connection is far more likely but it wouldn't hurt to check the accuracy of the ECU readout).

Mos.

[1jzracing]

no i didnt put a multimeter on it but i used to run a wolf and now run an autronic and they both read about the same so im guessing they are likely to be as accurite as any meter

[turbo ke20]

mate u should check it with a good multimeter at the battery and at the back of the alt before u jump 2 conclusions. u said i had 4 pins at the plug which usually would mean it not a bosch unit. could it be a nippon denso or hitachi alternator? if yes you should go 4 a bosch. there would definately be a maching one somewhere and bosch are much better and only need batt, warning light (L) and batt sense (S).....cheaper too
just abit of advice

justin