precedent 22volts on battery ??

smokey tennis shoe

Precedent PQ-06 four 12 volt batteries.

3 months ago, cart stopped while driving. Had to get towed home. Then I let the cart sit for 3 summer months.

So now, I checked voltage on the 4 batteries, and all were down in the 4 volt range . I plugged in the club car charger, and obviously, it would not come on.

So I tried to jump start the cart with a 48 volt clamp on charger, to boost voltage up enough to kick on the club car charger.

So I hooked up and turned on my 48 volt boost charger, then put the meter across the batteries. While the charger was running, I right away measured 9 volts on 3 batteries, and 22 volts on the other battery. So I was afraid I might blow something up, so I removed my charger. After removing the charger, I measured voltage again, and there was approximately 9 volts on all 4 batteries. And there was 40 volts across entire pack.

I hooked up clamp on charger again and turned it on. I then measured pack voltage with charger running, and got about 57 volts, and still was getting 22 volts across the front battery.

NOW I removed the charger, checked the solenoid and was getting the 40 volts thru the large solenoid terminals, with tow switch in tow,

I unhooked all wires to solenoid, and am still reading 40 volts on the big yellow wire that is going to the controller???

I don't have a charger issue, I have tried the charger successfully on another cart.

WHY am I getting voltage on the big yellow wire? It is like an electrical back feed? Is my controller a goner?

Help.

BGW

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Sergio

It sounds like the front battery, the one you get 22v accross is bad. You are not actually getting 22v accross the battery, but instead between the 2 points you are placing the probes. Most likely as soon as you try to run some current accross that battery, it opens up, so your are reading the charger voltage minus the voltage accross the 3 other batteries (as the total between those 2 points has to add up to the charer voltage).
Did you also disconnect the resistor accross the solenoid before taking your voltage reading on the yellow wire?

Volt_Ampere

Your battery that reads 22 volts during charging is badly sulphated or out of water. Probably the former. IT will not pass enough current to ever run your cart. It's a gonner.

smokey tennis shoe

The front battery definitely has water in it, and is only 1 year old,

also, there is no resistor or diode on the solenoid. The solenoid is one of the compact looking rectangular ones.

In the yellow wire, there is a secondary loop that has a resistor in it, and that reads 247 ohms.

Why am I getting the full voltage on the big yellow wire that is attached to the controller, when the other end of the yellow wire is disconnected from the solenoid, and just hanging in mid air?

Sergio

if you have not discharged the capacitors in the controller , that is probably what you reading.

smokey tennis shoe

As the 4 batteries sit, without the main positive hooked up, I have 9 volts on each individual battery. ( I realize these need charging).

The 22 volts show up, when all wires are hooked up, and the charger is on.

Volt_Ampere

The 22 volts is caused by a high resistance in that battery. I bet your cart doesn't run.

dave*m

When a battery reads a high voltage when on carge it is shorted out internally.The battery pak votage or just below is the capacitor voltage in the controller from them storing a charge through the resistor as mentioned. A 48 volt cart needs 36 volts to turn the relay on in the charger otherwise nothing will happen.

smokey tennis shoe

I will be back at the cart this week, and will try replacing that battery with a different battery, to see if I still get the 22 volts.

This is very strange to me. I still don't understand, why I can read the 22 volts, when I have the pack positive wire disconnected, and I am reading the 222 volts, from the large yellow wire on the controller, and to pack negative?

dave*m

That is the capacitor voltage in the controller that is stored there.That is normal,it should be around .5 volts below whatever the battery pak voltage was.