[RyanGT]

Alright, i remember somewhere that some types of batteries once dead will start killing the alternator. Or if they are low on juice and the alt has to charge a battery it starts frying the alt's diodes. Does anybody remember where this post is?

Also voltage. If i have good grounds (checked and cleaned). I get 14.4 volts at alt, with chassis ground. I get 14.4 with pos battery to chassis ground. But ~13.4-.6 (little lower with lights) across the battery. And if i add a ground wire to the chassis ground i used for a 14.4 reading, and still use the terminal i get the same 13.6.

So my battery is losing voltage correct, adding resistance to the charging system? The thing doesn't last long, and leaks like crazy (cheap autopart battery). It leaks out both water plugs.

Summery: what battery when low/empty fries alts diodes? And voltage drop across battery, but not from alt to chassis is a battery problem?

Searched through 20 pages of "battery" and got nothing. Besides good batteries are interstate, die hard, and motorcraft; optima if you never lose a charge.

[RyanGT]

Bump! I know it isn't one of the 1000000000 supercharger question posts that have been answered a million times but....

[F8L GT]

Only thing I have ever heard was if an optima battery goes completely dead, that it will not keep charge again. havent heard anything like your talking about tho ryan

[ajm]

"Summery: what battery when low/empty fries alts diodes? And voltage drop across battery, but not from alt to chassis is a battery problem?"

Ive never heard of a particular battery that will cause such an issue although generally I have heard if you try to run the car w/o the battery (such as disconnecting the battery while its running) you can fry the alternator. Donno how true it is though because ive never done it or ran into such an issue which the battery has been completely dead but the car is still running.

For what you guys are saying about the optimas I guess that is in regards to the optima red top?

[F8L GT]

Originally Posted by ajm "Summery: what battery when low/empty fries alts diodes? And voltage drop across battery, but not from alt to chassis is a battery problem?" Ive never heard of a particular battery that will cause such an issue although generally I have heard if you try to run the car w/o the battery (such as disconnecting the battery while its running) you can fry the alternator. Donno how true it is though because ive never done it or ran into such an issue. For what you guys are saying about the optimas I guess that is in regards to the optima red top?

I think that is somewhat true, Thats why they make and special wire with a relay for kill switches on cars that have an alt. I always run without my alt hooked up so i never worry about frying it. Its somthing about a voltage spike that will kill it

[RyanGT]

Hmm yeah, i know it was somewhere on here. What about lighter batteries? Normal ones are heavy as shit. Dry cell's dont have a long life though so i hear.

[F8L GT]

You think these are heavy, you should try lifting the 2 16v batteries we run in my dads maverick

[RyanGT]

Haha, well im just looking to shed weight when possible.

[02Roush]

A defective battery (Will not hold charge) will cause an alternator to run in a high load condition continuously which can/will ruin the alternator over time. Not sure about your voltage numbers and how this applies, but I have also read this can work the other direction also. A defective alternator could degrade the battery in some ways...

[F8L GT]

Originally Posted by 02Roush A defective battery (Will not hold charge) will cause an alternator to run in a high load condition continuously which can/will ruin the alternator over time. Not sure about your voltage numbers and how this applies, but I have also read this can work the other direction also. A defective alternator could degrade the battery in some ways...

yes a bad alt will degrade a battery because your using the battery to run everything instead of the alt. it will drain the battery way faster

[RyanGT]

My battery does a shitty job holding a charge too. Been drained too many times. Every since my GF sat in the car and killed the battery. Then it has just happened easier and more. And gets worse everytime.

So no awesome batteries i could try out that are better? Or just find an interstate and be done with it.

[F8L GT]

I like Motorcraft batteries, but they are made by Johnson Controls, which is also the company that makes the walmart Everstates. The motorcrafts are just more because your paying for a way better warranty

[02Roush]

Found this...may not help your car but will help everything else...

YouTube - Insane car battery hack

YouTube - Insane car battery hack

[RyanGT]

Originally Posted by 02Roush Found this...may not help your car but will help everything else... YouTube - Insane car battery hack

LOL wtf!

[ajm]

Originally Posted by RyanGT My battery does a shitty job holding a charge too. Been drained too many times. Every since my GF sat in the car and killed the battery. Then it has just happened easier and more. And gets worse everytime. So no awesome batteries i could try out that are better? Or just find an interstate and be done with it.

Id just find an interstate, evermaxx, optima, motorcraft, whatever seems to float your boat and go with it. Thats just me though . I cant really think of a battery that stands out above and beyond others. Ive got a cheap autocraft or some bs in the car thats about 2.5 years old and a optima yellow top in the truck that will be 4 years old in june and I couldnt tell you the difference between them performance wise...They seem the same besides looks. Although I will say the optima has taken quite a bit of abuse and still keeps kicking.

[RyanGT]

But you guys agree the resistance drop through the battery... is the battery?

When car is off, i get .6 more volts from positive to chassis.

[RyanGT]

This is my third or so shucks battery. They keep leaking all over the place. So im going with a brand name hehe. This one has been leaking out the top for awhile too, just not enough to make it stop working (till now).

[F8L GT]

My battery is still the factory one lol

[ajm]

Originally Posted by RyanGT But you guys agree the resistance drop through the battery... is the battery? When car is off, i get .6 more volts from positive to chassis.

Makes sense but who knows. Do you have another battery to test it with?

Not trying to say get an optima I think theyre the best etc bc personally I dont care what it is as long as it starts the car lol. But as far as durability about 2 years ago I had a magnetic tray sitting on the side of the battery and bumped into it. It contacted both terminals and it started to crispy critter it. By the time I pulled the tray away about 1/4 - 1/8th of the pos. post was melted away and there was a couple holes melted in the magnetic tray. It still runs just as strong to this day.

Never used one but ive also heard a lot of good things about interstate.

[RyanGT]

Nada i don't. Im guessing resistance from being low of battery acid? Or being a shitty ass battery. Weird that i can use a ground wire, that is connected to the battery. And get better voltage (.6 with car off).