Alternator
 

Did a alternator test with a volt meter hooked to battery. Rpm about 2500. This is the reading I got. Do I need a new alternator? Car fires right up. Thanks for suggestions.
https://cimg0.ibsrv.net/gimg/www.cor...182be61d3.jpeg

I think 12.5 ok..
this is good chart i was given on this forum
if you need alternator and yours is original…KEEP it..and rebuild it.!!!

https://cimg1.ibsrv.net/gimg/www.cor...f973f2729.jpeg

I do t know if it is. And I don’t know how. It’s a Delco. I read that anything under 13, that it needs to be replaced.

Post a pic of the Part Number. The application is easy to find. http://corvettec3.ca/index.htm
I think I found the numbers for my ‘71 there. And , if you don’t want an original alt case, I’d like it.

Steve O.

If that thing is reading 12.4 vdc (I cannot see it for shit) at 2500 rpm, then your Alternator is not adequate. Remove it and go get it tested.

Loaded it’s 12.3 loaded. 12.40 unloaded. If you touch pic you can then zoom in with your fingers.

The chinesium replacements are crap..and draw more horsepower than oem..
if you are 12.4, you are on low barely out.
if driving, starting, and handling power draws ok..i would drive it…
keep an eye on it..drive around headlights on and park it and measure battery voltage..
pics of alternator? And numbers?

i don’t see any part numbers. It was in the car when I got it 3 years ago. Only weird thing is my temp and battery gauge act weird. Battery gauge was moving yesterday and today it sits just under 0. Temp gauge worked good yesterday and today it didn’t move. But then started moving. Here are alt pics.
https://cimg5.ibsrv.net/gimg/www.cor...424eedec3.jpeg
https://cimg8.ibsrv.net/gimg/www.cor...09f7329e7.jpeg

That voltage is too low; it should be about 14.5V when charging. Review my recent thread:
https://www.corvetteforum.com/forums...ery-drain.html

Part number is towards the belt on the same side of altearnator casing where the 2 wire plug goes into it. see mine in attached pic.
https://cimg7.ibsrv.net/gimg/www.cor...a4332d172.jpeg


Fran

Take a look here for numbers..
it looks like a rebuild as it is clocked wrong..but try to see numbers anyway , unless blasted off..

https://cimg5.ibsrv.net/gimg/www.cor...4cf96913b.jpeg

I will go and look. Would this cause my gauges to act goofy?

Maybe..
lets see what numbers say..if crap rebuild..someone can maybe recommend a non chinesium replacement..

I would make darn sure your battery cables are tight and your ground connections are tight and not corroded.

Looks like somebody’s got an extra ground(s) down there to going somewhere

https://cimg1.ibsrv.net/gimg/www.cor...778c6d990.jpeg

It could. As for a rebuilt kit. I got this one off of Ebay. A great product and it contains more parts than the NAPA kit I bought and for 1/2 the price. It has been working great.

https://www.ebay.com/itm/190606801960

Fran

Cant make the numbers out. All I know it’s a Delco Remy.

What you mean clocked wrong? It’s been this way and ran fine for 3 years.

If you cannot read numbers in the place they should be, it is probably a rebuild that has been blasted to oblivion, but just make sure in case original and someone rebuilt and clocked wrong.
Beng clocked wrong is about where it should be for wires, placement etc.. same alternator, 1000 applications…both halves can be split and repositioned.
What do those ground wires go to? Do you have electric fans?
this site / linkmay help
http://www.madelectrical.com/electri...elcoremy.shtml

https://cimg8.ibsrv.net/gimg/www.cor...e064cf3362.png

There are numbers but I will have to remove alternator and still might be readable. There is one electric fan. There used to be a msd connected but has been removed. Not sure if that ground wire has anything to do with what you asked. This is a big block car just saying.

Reading your profile you have a big block 454.
I believe your clocking is correct for your application.
Your unloaded test results are low, should be around 14 vdc.
If the loaded test was done with both the HI Beam headlights and blower motor on HI that to looks low, should be in the mid 13vdc range

I don't know what was recorded in the test you had done?
Here are test results for my 80 amp alternator and good battery using a different tester.
https://cimg3.ibsrv.net/gimg/www.cor...979a46d18b.jpg

In my experience anything under 13.5 volts while charging, loaded or unloaded is insufficient. It looks like rebuild time.