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Unread 08-12-2015, 08:44 PM   #11
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Default Re: Small Jolt From Battery Pack Neg and Frame

The battery You are calling #6 is that the pack negative post?

Is the voltage only present when the charger is plugged in?
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Unread 08-12-2015, 09:02 PM   #12
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Default Re: Small Jolt From Battery Pack Neg and Frame

Yes. The #6 battery negative. Yes, I get 49.2 volts with the charger turned off, 56.5 when its on. I've wrapped all the battery tie downs with electrical tape and I took the batteries out and sprayed liquid rubber on all the battery baskets...anything that might be touching any part of a battery. The strange thing is that it doesn't seem to discharge the batteries...not very quickly anyway as the voltage reads the same after hours at rest.
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Unread 08-12-2015, 09:07 PM   #13
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Default Re: Small Jolt From Battery Pack Neg and Frame

So from pack negative to frame You get +49.2v, What are You getting from pack positive to frame?
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Unread 08-12-2015, 09:08 PM   #14
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Default Re: Small Jolt From Battery Pack Neg and Frame

Oops! You said "charger plugged in", not sure, as soon as it finishes the charge cycle I'll test. I just turned the AC off and measured so as to not interrupt the charge cycle. It's doing the equalization thing now, so shouldn't be much longer. Thanks for replying to my rambling know-nothing posts.
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Unread 08-12-2015, 09:23 PM   #15
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Default Re: Small Jolt From Battery Pack Neg and Frame

From pack positive to the frame, I get 1.283 volts, if that...the meter kind of just jumps around .
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Unread 08-12-2015, 10:16 PM   #16
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Default Re: Small Jolt From Battery Pack Neg and Frame

Maybe something on the other side of the pre-charge resistor due to the small difference from pack positive...

Can you measure from the controller B+ to frame to see if You get 0v?

It would be best if You have a multi-meter with a low impedance setting (LoZ) like a fluke in case is just some ghost voltage reading.

Also, was the voltage there with the charger unplugged as well?
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Unread 08-12-2015, 10:19 PM   #17
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Default Re: Small Jolt From Battery Pack Neg and Frame

I'll borrow my neighbors fluke meter tomorrow and verify the readings. I'll try and get to the controller...it has a protective case I'll have to remove...thanks again.
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Unread 08-12-2015, 11:02 PM   #18
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Default Re: Small Jolt From Battery Pack Neg and Frame

Stray voltage readings are not uncommon on sparky carts. I have never seen a definitive answer as to why, but I do know a way to test it and determine whether you should be concerned about it.

If you read a voltage from point A to point B, simply substitute your probes for the terminals of a pigtailed taillight bulb. If the bulb lights AND STAYS LIT, you have an issue somewhere. If the bulb doesn't light, or goes out right away, the issue is ghost voltage, and is probably of no concern as it is incapable of sustaining a draw. Clean batteries are happy batteries.

Edit: This assumes that the voltage being applied to the bulb doesn't wipe out the bulb instantly. Retesting will prove the bulb is still valid.
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Unread 08-13-2015, 09:31 PM   #19
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Default Re: Small Jolt From Battery Pack Neg and Frame

Quote:
Originally Posted by gornoman View Post
Stray voltage readings are not uncommon on sparky carts. I have never seen a definitive answer as to why, but I do know a way to test it and determine whether you should be concerned about it.

If you read a voltage from point A to point B, simply substitute your probes for the terminals of a pigtailed taillight bulb. If the bulb lights AND STAYS LIT, you have an issue somewhere. If the bulb doesn't light, or goes out right away, the issue is ghost voltage, and is probably of no concern as it is incapable of sustaining a draw. Clean batteries are happy batteries.

Edit: This assumes that the voltage being applied to the bulb doesn't wipe out the bulb instantly. Retesting will prove the bulb is still valid.
Just checked mine with a Fluke, had 30 volts from #6 negative to frame and down about battery volts till the fourth from negative #6 and it was -5 volts. Tried a H1 headlight bulb that lit on the single battery but not from frame to Negative, Checking Allen Bradley PLC outputs with a Digital meter would give a voltage reading , so we were shown the load with a lamp trick .
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Unread 08-14-2015, 07:15 AM   #20
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Default Re: Small Jolt From Battery Pack Neg and Frame

I left the model range off my original post, it should have said:

Quote:
It would be best if You have a multi-meter with a low impedance setting (LoZ) like a fluke 11x series meter in case is just some ghost voltage reading.
Not all flukes have low impedance, I have the model 117 which does, I tested my Precedent in regular vDC and get about 0.12v, when I use the LoZ setting I get 0v.

Do You guys have any cables that are zip tied to the frame or running in close proximity?

I agree the light bulb trick is a good one and will work in parallel with any meter and should give You a 0v reading if it is just induced voltage on the frame.
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