I changed the whole column/switch's a couple of months ago

 

You don't understand. The belt rides on top of the damper. If it is spinning the alt will never turn at the correct rpm and will never charge the battery.

 

Think he's got your problem down cold. Put the mark on the side of the hub where it meets the crank. Makes sense to me since when your idling higher, your voltage is higher. But, are you using a voltmeter or still relying on the gage in the dash?

 

this was the problen I had on mine. Damper looked fine, but I took the belt off I could turn the outside hub. It also make noise like the fan belt was slipping.

 

just to clarify your talking about the Harmonic Balancer correct ?
If so and it is spinning with the belt of how to I clarify the problem ?
Rob I apologize I misunderstood you earlier

 

Try tightening the bolt with loc-tite using an impact gun. Put your white mark on it again and go for a ride. If it slips again, you're gona have to remove the hub and see what the end of the crank shaft looks like.

The only thing that bothers me about this theory is it should be squeeling like a pig at a roast. But I did'nt see you mention anything about noise. Is it noisy?

 

it sounds fine at idle and at high rpm i found that Thunder racing sells a keyed hub for the LT1 that might be the way to go if it is slipping i try it tonight and post my findings

 

yes, that is correct. Two ways: 1. remove the belt and see if you can move the outside ring by hand. 2. paint a straight line acroo the front of the damper. then either let the car idle for 10 mins or drive it around the block and see if the line you painted still lines up. You may want to rev it up a couple of times to be sure the damper isn't moving before you check if there wasn't any line movement.

 

well that's not the problem , I can move the whole crank maybe an 1/8 of an inch , the hub/damper are tight on the crank any other ideas???

 

ttt

 

any ideas ????

 

What is your engine speed at idle?

 

800 in park and 700 in gear

 

Have someone press the throttle to about 1000 and measure the battery voltage.

 

this is a great post i am having the same problem. except my voltage starts at 14 volts then after running for a while it goes down to 10.6 volts. maybe bad damper or belt??