MIC123321

alright, i just blew out my third alternator in about eight/nine months, which i don't understand why it keeps on happening. I only have an 1200 watt sony amp and one rockford p3 sub, nothing to crazy. I also have a rockford power cap and a red top optima battery to but less pressure on the alternator to keep things charged and it still keeps going out? Whats going on here, could somone give some info. on whats happen?

Kaiser

iTrader: (1)

What kind of battery do you have? Perhaps it's being sucked dry by the stereo? Is there a ground that is broken or not attached to the frame? That could cause issues too.

I have a spare alternator in a cabinet and another one when I pull my motor in 2 weeks. Let me know if you need one. Or you might need both to figure this out.

Lexus Boy

i think mines bad too im gettin mine checked today

MIC123321

i just bought a red top optima like 3 months ago, but i do have a power capacitor to store power for the stereo?

MIC123321

but the thing this time is that the battery light only comes on when i'm at a red light and at the lowest rpm, but when i get going the battery light goes off?? it's the alternator right?

Lexus Boy

i have the same battery...mine went dead yesturday auto zone recharged it for free an they checked my ALT today for free as well turned out fine

Kaiser

iTrader: (1)

Could be a bad ground. Atlhough the stock lexus alternator is 80 amps. How many amps does the car amplifier pull? Electric fans? A/C is probably on. Car is running that takes some juice.

MIC123321

i will check it later today when i get back from work.

MIC123321

well, that said that my alternator blew again and the battery too. all grounds are fine, so hopefully it doesn't do it again. Thanks for the help guys,MIC

LayinLo

I had the same problem when I hooked up my system, I was running my old, old school fosgate 1100a2 amp. I had to replace my alt. every year until recently got so fed up had an electrician add more amps to my alt. and now Im ok.

I would suggest you upgrade on The Big 3, Deep cycle battery, alternator w/ more amps, and a thicker gauge wire..

shoaf213

I've had CONSTANT problems with my alterntor, I tried high output and it was no good either, so I got cheapie from autozone and traded in the Optima for regular battery and so far haven't had any more problems

LayinLo

After about 3 yrs or so my yellow top completly gave out, now Im running on a autozone cheapo battery until I get done with my current install- I'm looking to get another yellow top soon, cause this autozone batt has only been in the car about 4 months and its already dead, lol Haha, thats because the car has been in the garage for 4 months w/o starting it.

MIC123321

how do you add more amps to the alternator? Do they make high-output alternator for the 1 gen gs and how much would something like that cost.

shoaf213

There's a link off my website....which is off my sig, scroll down to 170 amp alternator

LayinLo

You can find a H O alternator for this car, not cheap though. I got a quote for a stinger alt for 5 bills from a local audio shop a while back, thats way to much.

Regarding how to add more amps to the alt, thats probly gonna be a problem. Not many electricians are willing to do it (on a lexus). The most you would be able to add is about 40 amps, the guy that did it for me is a close friend.