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Author Topic: Voltage Regulator - Solid State - Ammeter Needle Vibrating  (Read 514 times)
jeff68
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« on: December 18, 2013, 04:17:01 PM »

I converted my original non-working voltage regulator to solid state using a Wells VR715.  Refer to this thread:
http://www.camaros.org/forum/index.php?topic=561.0;all

The VR seems to work as it should and the battery is charging properly.  However, I have noticed that the ammeter needle seems to vibrate - not a lot, but it's definitely moving back & forth around 1/8".  I checked all the connections, and everything seems to be good.

Any suggestions on what could be the culprit?
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68 L30 / M20 Convertible
Ash Gold
Ed Bertrand
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« Reply #1 on: December 18, 2013, 05:21:02 PM »

Was it doing that before you converted it?

Ed
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Ed Bertrand
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jeff68
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« Reply #2 on: December 18, 2013, 06:27:32 PM »

No, it wasn't.  I'm wondering if there is something about the solid sate VR that isn't playing nice with the ammeter.

Right now my plan is to, in the spring:
1)  Try a NOS mechanical VR that I have (date code very close to my original).
2)  Try a solid state VR715 "as-is".

I would really prefer to stay with a solid state unit, so if 2) fixes the vibration then I will put those 'guts' into my existing VR and see what happens.  If the needle still vibrates with 2), then I'll install my NOS unit.  If the needle continues to vibrate, then I guess I will need to triple-check all my connections & grounds.
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Ash Gold
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« Reply #3 on: December 19, 2013, 05:01:55 PM »

The solid state VR should have nothing to do except turn charging on and off on a as needed basis. Since the gauge is wired between the main bus on the Horn Relay and the main junction block I would clean up all those connections and grounds and see if it goes away. If not run your multi-meter across your battery and see if you have any storage issues - bad cell or other issue there.
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1969 Z-11 350/300 with 4 Speed
jeff68
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« Reply #4 on: December 19, 2013, 06:59:23 PM »

It's a brand new battery - no charging or storage issues at all as tested with a multi-meter.

I'll give all the connections another once-over this winter.

I only noticed the issue after the installation of the solid state VR.  So, I figured that the way the solid state VR turns charging on& off is different than the old mechanical VR, possibly causing the vibrating ammeter needle.
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Ash Gold
Everett#2390
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« Reply #5 on: December 19, 2013, 08:19:09 PM »

I would try another known good battery, maybe one from a daily driver, before discounting the VR reg.
Ensure the ground strap from the mounting bolt of the mech VR is also in place with the new VR.
Might even try a separate ground strap from the new VR chassis to the alt case for an experiment.
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A flashlight is a case for dead batteries.
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