Weird stuff after alternator change

[sacoffee]

Before I was reading 12.5 V at rest, 12.9 at idle and 14 and above at 2500 rpm. I changed the alternator to a rebuilt Paris Rhone (from our sponsor) and now I have a battery light.

Read voltage at 12.8 rest, 12.5 idle and the same12.5 at 2500 rpm

Does this tell me that the new alternator isn't charging?

[Bob Kontak]

At first blush, yes.

S/B in the 13's

New V Reg?

[sacoffee]

At first blush, yes.



S/B in the 13's



New V Reg?

Yes, all new with alternator. So I guess I have to take it all apart again and make sure the connections are good

[Targalid]

You don't say what car you have. If you have an earlier car, the voltage regulator is a separate unit on the left rear of the engine compartment, next to the CDI box. The alternator output is controlled by this device and, if defective, will not allow your battery to charge.

[sacoffee]

Originally Posted by Targalid

You don't say what car you have. If you have an earlier car, the voltage regulator is a separate unit on the left rear of the engine compartment, next to the CDI box. The alternator output is controlled by this device and, if defective, will not allow your battery to charge.

Sorry it is a 1988 with VR bolted to back of altenator

I checked and double checked the wiring before I buttoned it up. So when I pull it apart again I don't what to look or check for

[Bob Kontak]

Your car year is in your "Garage"

I feel for you as there is probably something silly causing this. Seems like you did what you should have done.

Before you pull the alternator, beat on stuff like the battery ground, connection at the starter, etc. For fun, pull the 14 pin connector at the rear of the engine compartment and re-attach it.

This may ALL be a function of some crap connection somewhere. Doubt it is in your wrenching.

[sacoffee]

Been researching other posts, seem it could be a number of things;

- perhaps I pulled on the blue wire too much?
- bad altenator?
- stupid question, but if the fan spins does this means the altenator spins too?

[porsche930dude]

also check the connections on the back of the alt bulb. I just had a no charge issue because the spades were totally rusted up.

[sacoffee]

Originally Posted by porsche930dude

also check the connections on the back of the alt bulb. I just had a no charge issue because the spades were totally rusted up.

That would be a coincidence

I am pretty convinced either the altenator is bad or the wiring is messed up when I installed the new one, probably the blue wire to the bulb isn't connected well, I had to repost this wire as it was pretty brittle when I pulled the old altenator out.

[Jdub]

Are you sure that your battery ground and posts are absolutely spotless, and that the battery is in good shape and not too old? When I replaced my alt., on first start, there was the alt light. But taking the car out, and driving it, the light went out and has worked properly ever since.

[sacoffee]

Originally Posted by Jdub

Are you sure that your battery ground and posts are absolutely spotless, and that the battery is in good shape and not too old? When I replaced my alt., on first start, there was the alt light. But taking the car out, and driving it, the light went out and has worked properly ever since.

Yeah, thanks, but the Battery is one month old and I cleaned the connectors when I installed it. If my volts were changing from 12.8 at rest and 12.58 at idles means no altenator?

[sacoffee]

It was the voltage regulator on brand new altenator, swapped it out with spare and it works fine