Stock Alternator Specs.

[r0lf-]

Well... my alternator is stock, its either from 93 or 78, im not sure. What were the stock numbers on the 78's?

I need to replace it, my windows really dont want to roll up or down anymore at idle. Any suggestions on what to go with. I have a 500 watt system installed also, so I need some juice. Power everything also.

[swervin ervin]

I don't think any of our trucks came with a 78 or 93 amp alternator. If I'm not wrong, they were 60 something amps.

[Frank-id]

Batteries store electrical energy. How much is stored is based on the battery capacity, as 450 ,600,or 950 amps.
An alternator's ampacity determines how quickly a battery will be refilled with amps.
Batteries can only hold a certain electrical voltage. A fully charged battery will reflect 12.6 volts using a digital volt meter or multimeter. Most alternators will make
NO amps or volts at idle. Alternators make power until the pulley spins at least 3000 rpm. The biggest single reason for alternator failure and poor output is.....POOR Grounds. Add a few grounds. Many vehicles ground the engine with only the exhaust. Every electrical device MUST have a good ground. There are few cars and trucks with perfect grounds. The make provided just enough of anything to make it work. Battery posts also contribute to many electrical failures.

[r0lf-]

Originally posted by swervin ervin
I don't think any of our trucks came with a 78 or 93 amp alternator. If I'm not wrong, they were 60 something amps.

I meant the year its from. The new motor or the stock motor. so 60 amp... no wonder it doesnt do jack

[r0lf-]

Originally posted by Frank-id
Batteries store electrical energy. How much is stored is based on the battery capacity, as 450 ,600,or 950 amps.
An alternator's ampacity determines how quickly a battery will be refilled with amps.
Batteries can only hold a certain electrical voltage. A fully charged battery will reflect 12.6 volts using a digital volt meter or multimeter. Most alternators will make
NO amps or volts at idle. Alternators make power until the pulley spins at least 3000 rpm. The biggest single reason for alternator failure and poor output is.....POOR Grounds. Add a few grounds. Many vehicles ground the engine with only the exhaust. Every electrical device MUST have a good ground. There are few cars and trucks with perfect grounds. The make provided just enough of anything to make it work. Battery posts also contribute to many electrical failures.

Ill have to check that. Ill make sure I have a strong ground directly to the frame. I swapped batteries with my old truck, I have the bigger one now and the old truck still has a higher voltage reading at idle than my new one does. Sounds like your on to something.

-edit
Just checked the truck and I have a ground to the alternator, thats about all I can see out there in the dark. Ill compare with my old truck and see what I can do to improve things. Id really like to be able to use my windows again

[r0lf-]

Well... looks like my grounds are just fine. I even made sure it was good and changed it to the frame. My alternator prolly just sucks. I may swap alternators with my 80, since it seems to recharge really quick. Im selling the bugger anyway, pretty much for parts and it has power nothing, so it wont be missed.