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Old 11-18-2012, 09:55 AM   #1
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Default Need 20484 Charger help

I have the following charger:

EZ GO Textron 36V Total Charge Model 20484 Listed 20L4, serial # 68728, the circuit board is 27417 G01.

Heres what I have.

39V at the plug, no current draw on a battery bank that reads 33V. I've checked both sides of the ammeter and I have 39V on both connections. That tells me the shunt in the meter has continuity. Even with that continuity is it possible the meter is still bad? Can I just jumper the meter out of the circuit and check the output with a DC amp clamp?

Thanks for your time.
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Old 11-18-2012, 04:56 PM   #2
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Default Re: Need 20484 Charger help

If you have 39V at the plug and 33V at the battery pack, there is an open somewhere in the charge loop.

Yes, the meter can be bad while the meter shunt is still has continuity.

Is this the type charger you have?
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Old 11-20-2012, 12:59 PM   #3
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Default Re: Need 20484 Charger help

Yes, that's the unit I have.

Let me clarify, I used a battery pack that read 33V before I connected the charger, I connected the charger and I get 39V at the battery pack.

Shouldn't I be getting on the order of 42V out of the charger?

I'm going to jumper the meter today and see what I get.

Thanks for your time and quick response.

Paul
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Old 11-20-2012, 01:41 PM   #4
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Default Re: Need 20484 Charger help

The batteries are/were horribly discharged, so it is going to take hours to charge them, if they can be charged.

The pack voltage starts at wherever it starts at and climbs until it reaches a predetermined voltage in the 44-465V range, which shuts off the charger.

How long it take to get there depends on hopw low the batterie were and the condition they are in.

Climbing ti 42V is usually fairly quick (an hour or so) and from there to shut off may take 6-10 hours.

With batteries discharged down to about 70% State of Charge, 4-6 hours total charge time is typical, with good batteries.
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Old 11-21-2012, 08:57 AM   #5
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Default Re: Need 20484 Charger help

Well we've determined the charger is not putting out any voltage, it buzz'z when turned on but the voltage we're reading is the battery pack not the charger. We've by passed the board, diodes are good, when checking the transformer we get on the order of .03 ohms on both winding's but I don't know what it should read but I would think something like a dead short. We have no way of testing the capacitor.

I'm at a loss
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Old 11-21-2012, 09:53 AM   #6
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Default Re: Need 20484 Charger help

Here is how to check both transformer and capacitor.

You'll have to (or at least you should have to) jumper the relay to get the charger to turn on when it's not connected to cart.

If the capacitor is bad, a Motor Run capacitor from you local electrical supply will work. (Motor run, rather than motor start, and the same MFD)

Yell if you need more help.
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