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Unread 03-06-2017, 10:41 AM   #1
Not Yet Wild
 
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Default Electrical Short to Chassis

On my 48V 2006 Club car ds there is a constant short somewhere to the chassis of the cart. Doesn't matter if cart is on/off or lights on/off. As I understand it the chassis of the club car should be totally electrically isolated.

I have 46V (45.6 to 46.2V) when I measure from Battery Negative terminal of first 8V battery to chassis. Total voltage of battery pack is 50V.

1. Obviously there is a short somewhere to the chassis that must be found.
2. How can any type of short cause there to be 46V. I could understand 50V but not 46V. One battery down from 50V is measuring around 41V.

Anyway just starting to hunt down this issue and thought I would ask if anyone else has any ideas.
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Unread 03-06-2017, 11:36 AM   #2
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Default Re: Electrical Short to Chassis

Often you get this type of voltage with little or no significant amperage, often referred to as ghost voltage from wet or seeping battery cases. Another CC source of unwanted frame voltage is the OEM 16 to 12v voltage reducer.
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Unread 03-06-2017, 01:06 PM   #3
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Default Re: Electrical Short to Chassis

Carbon "tracking" in the motor?
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Unread 03-06-2017, 01:15 PM   #4
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Default Re: Electrical Short to Chassis

Like scottyb said, I would start with the batteries since that is an easy and needed maintenance item.

Mix 1 cup baking soda to 1 gallon warm/hot water.

Pour that mixture over the batteries and allow it to flow all the way around the sides.

Rinse with a low pressure water source.

Do not do it over your concrete driveway because acid will stain the concrete.

Electrolyte is conductive and it will give You ghost voltage readings.
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Unread 03-06-2017, 01:18 PM   #5
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Default Re: Electrical Short to Chassis

And occasionally some shade tree mechanic will ground a set of aftermarket lights to the chassis.
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Unread 03-06-2017, 02:34 PM   #6
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Default Re: Electrical Short to Chassis

If you care to check it out you will likely have voltage from your tires to battery pack. no joking.
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Unread 03-06-2017, 03:16 PM   #7
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Default Re: Electrical Short to Chassis

Quote:
Originally Posted by scottyb View Post
And occasionally some shade tree mechanic will ground a set of aftermarket lights to the chassis.
Mine had a horn that was grounded by the horn housing. Had to isolate using a plastic mount.


.
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Unread 03-06-2017, 08:43 PM   #8
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Default Re: Electrical Short to Chassis

Quote:
Originally Posted by mrgolf View Post
If you care to check it out you will likely have voltage from your tires to battery pack. no joking.
How do you measure voltage from tires to battery pack?
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Unread 03-06-2017, 09:36 PM   #9
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Default Re: Electrical Short to Chassis

Quote:
Originally Posted by scottyb View Post
And occasionally some shade tree mechanic will ground a set of aftermarket lights to the chassis.
Or you find a fused wire to chassis ground & 2 batts later a positive to the light Sw.
Was told that was "the norm" years ago

Put batts in an
Old 36 v Yamaha today that has that set up
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Unread 03-06-2017, 10:08 PM   #10
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Default Re: Electrical Short to Chassis

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Originally Posted by MichiganBob View Post
How do you measure voltage from tires to battery pack?
One meter probe on tire the other on main positive or negative depending on which one you have on tire.
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