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Old 05-20-2022, 11:23 AM
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Default Golf cart tech help

Multiple battery systems scare the shit outta me. I am not sure why. Maybe just because I do not understand them.


In any case, we have this old golf cart that LadyD wants out of the yard. The last time we used it was in February for a charity event. Worked great all day. Charged it up and parked it. I'm sure I should have gone out to inspect it before now but I didn't.

I decided I'd give it my best shot to sell it this weekend. Inserting the key and flipping the power on, the dash light battery status indicator is flashing on the low side. I can understand that. Logic says to push it closer to an electrical outlet and plug it in, so I did. However, the charger didn't make any noise like it usually does.

Flipping up the seat shows some corrosion on the battery terminals that needs to be addressed. While it doesn't solve the non-charging issue, I'd feel better cleaning it up before folks come to look at it. To do it properly, I likely need to disconnect the cables but I do not know if there is a proper order to do this. There is no main plug that I can find to disconnect the system. Is there a preferred order, or do you just start disconnecting them? Is there a hazard in the process or am I imagining it?

If I had the money I'd go ahead and buy all new batteries for it and feel pretty confident I could recoup my money. It's a nice cart with a fancy paint job and a full cloth enclosure and windshield. More bare bones carts in the area are going for $3500 right now. I'd be okay getting $2500 out of it today and just being done with the thing though.
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Old 05-20-2022, 12:40 PM
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Cleaning battery posts is easy. You do have to remover the battery cables from the batteries and mix a teaspoon of baking soda in a glass of water and pour on the post and cable. Then use a battery cable brush wire tool to clean each post and cable. After all are cleaned, rinse off the area with water. I use the felt washers to slide on the posts to prevent future corrosion, then reinstall the cables and charge the batteries.
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Old 05-20-2022, 12:51 PM
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Any baking soda that leaks into the battery will kill the battery.

Had some get past the post and killed the battery...... the post/hole/casing are "NOT" sealed all that well.
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Old 05-20-2022, 01:59 PM
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Check your hearing
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Old 05-20-2022, 02:22 PM
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I think you just had a loose connection at the battery so the charger didn't "click on". Unless there is highly sensitive circuitry, which I doubt, you should just be able to disconnect (-) then (+) being careful not to short either cable until all the cables are disconnected from the batteries. Is it a 24v system? Two 12v in series?
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Old 05-20-2022, 02:40 PM
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Quote:
Originally Posted by dubby View Post
Multiple battery systems scare the shit outta me. I am not sure why. Maybe just because I do not understand them.

I likely need to disconnect the cables but I do not know if there is a proper order to do this. There is no main plug that I can find to disconnect the system. Is there a preferred order, or do you just start disconnecting them? Is there a hazard in the process or am I imagining it?
No real proper order, but
disconnect the ground first so as to limit accidental shorting if you drop the/A positive lead to the metal chassis of the vehicle.

Had a friend that a battery exploded, was trying to replace an over heated battery, no water .... hydrogen gas builds up when charging and it only takes a spark from disconnecting a battery cable for hydrogen to ignite.
should always wear safety glasses and a shield.
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Old 05-21-2022, 09:49 AM
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Ended up having to put this on the side burner for the afternoon yesterday, but it still needs doing. I'm leaning towards the suggestion that one of the batteries does have a bad connection, likely due to the nastiness of the thing.

This one has 6 batteries. What I've read online indicates that this is a 36v system. Other reading has told me that golf carts do not have a chassis ground like autos do, so the idea is that once you disconnect any cable the thing is supposed to go dead unless you accidentally cross up the posts/wires.


Another technical question--multimeter use and settings.

What is the best way to test these out for both voltage and continuity? I did check the fuses (upper left of pic 2) and they all appear good. That's about as fancy as I usually get
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Old 05-21-2022, 10:07 AM
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You have several connections that need to be replaced or cleaned
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Old 05-21-2022, 10:36 AM
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Quote:
Originally Posted by digr View Post
You have several connections that need to be replaced or cleaned
Yes take them all off and wire brush everything. Then do your testing.

Also do not fill the batteries up until after they are charged. If you look in and see the plates are not covered just put enough water in to cover the plates then charge.

After you get connections clean connect your voltmeter ( set to DC volts) where the charger is connected and you should have something close to 36 volts. That is if the batteries are good.

The batteries are wired in series so 6 volts x 6 batteries will get you 36 volts.

You have lots of cleaning up of terminals to get to first.

Scott
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Old 05-21-2022, 11:24 AM
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I'd pretty much guarantee your charging issue is tied to those cruddy battery connections.
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