Alternator spring

[ajs350]

My 79 will not get to 13volts until 4000rpm. I'm wondering if my alternator spring needs replacing as it measures just 25mm. I think I read somewhere that a new one is 32mm?
Can anyone confirm this?
Thanks
Ross

[steve murdoch icoa #5322]

New one in the bag measures at 24.77, so yours should be fine.
Do you have both the fibre and metal washers?
Although i have run with one metal washer and with 2 metal washers because the fibre one is no longer available.
Is it making that godawful chirping noise when in use?

[EMS]

The voltmeter in the CBX is not the most accurate instrument to begin with. But make sure that the connector of the alternator is in good condition, i.e.: the terminals are clean and not corroded. A bad connection increases the resistance and prevents the alternator from charging properly.

[Rick Pope]

This has been discussed at length, but I'll throw this in anyway:

Your volt meter only shows how much energy is in the battery, not the output of the alternator. So, it follows that the battery voltage will take a few moments to come back up after a start-up.

If you want to know if the alternator is charging, use an ammeter. I use a cheap inductive model from K-D Tools. Just lay it against the wire and the needle will indicate how much it's charging.

I hope I didn't oversimplify it.....

[ajs350]

The voltmeter in the CBX is not the most accurate instrument to begin with. But make sure that the connector of the alternator is in good condition, i.e.: the terminals are clean and not corroded. A bad connection increases the resistance and prevents the alternator from charging properly.

I cleaned the connector with copperbrite and the volt meter is now showing 13v at 3000rpm; much better.
Thanks for the tip. Now I need to do the other connectons!

This has been discussed at length, but I'll throw this in anyway:

Your volt meter only shows how much energy is in the battery, not the output of the alternator. So, it follows that the battery voltage will take a few moments to come back up after a start-up.

If you want to know if the alternator is charging, use an ammeter. I use a cheap inductive model from K-D Tools. Just lay it against the wire and the needle will indicate how much it's charging.

I hope I didn't oversimplify it.....

I'm still new to these CBX's so the simpler the better! Thanks
Ross