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Old 11-01-2017, 02:54 PM   #1
rockfordpi
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Default PDS acrs when connecting battery terminal

PDS cart, short battery life, have load tested the batteries. Looking for battery drain.

When I touch the main positive cable to positive terminal I get a pretty strong arc. Does not arc with RT switch off. Also, after initial arc, does not arc again until I switch RT off and back on. It like it is charging a capacitor or something.

Also, with RT switch on, the wire from charger port arcs when I touch to main positive and it arcs even without charger connected.

Any ideas?
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Old 11-01-2017, 02:59 PM   #2
scottyb
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Default Re: PDS acrs when connecting battery terminal

You didn't say what speed controller you are using or whether there is a pre-charge resistor on the controller but ...... The controller will draw significant power initially to load it's capacitors - once loaded this spark disappears until the charge drains off.


So none of what you posted sounds unusual. You may have a voltage reducer that is draining the pack?
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Old 11-01-2017, 03:42 PM   #3
rockfordpi
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Default Re: PDS acrs when connecting battery terminal

Quote:
Originally Posted by scottyb View Post
You didn't say what speed controller you are using or whether there is a pre-charge resistor on the controller but ...... The controller will draw significant power initially to load it's capacitors - once loaded this spark disappears until the charge drains off.


So none of what you posted sounds unusual. You may have a voltage reducer that is draining the pack?
Is it normal to get that arc from the white charger port wire when you connect it to main positive without charger plugged in? There is no short between charger port pins

Little more info.
No Voltage reducer.
Controller is curtis 1206mx and has a resistor on solenoid.
Battery Reserve capacity is rated at 105 min at 75 amps.
Load test gave 75 amps for 65 minutes.

Cart will run about 3 on dirt road miles on a full charge. 20.5" tires.
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Old 11-01-2017, 03:47 PM   #4
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Default Re: PDS acrs when connecting battery terminal

I just added a voltage reducer for my lights and noticed the same spark.
I un plugged the the reducer and no spark. Is it ok for things to just put up with the spark
or unplug the v r first before messing with batts
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Old 11-01-2017, 03:52 PM   #5
rockfordpi
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Default Re: PDS acrs when connecting battery terminal

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Originally Posted by Fabdaddy View Post
I just added a voltage reducer for my lights and noticed the same spark.
I un plugged the the reducer and no spark. Is it ok for things to just put up with the spark
or unplug the v r first before messing with batts
I do not have a voltage reducer and lights are disconnected
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Old 11-01-2017, 03:59 PM   #6
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Default Re: PDS acrs when connecting battery terminal

Quote:
Originally Posted by rockfordpi View Post
Is it normal to get that arc from the white charger port wire when you connect it to main positive without charger plugged in? There is no short between charger port pins

Little more info.
No Voltage reducer.
Controller is curtis 1206mx and has a resistor on solenoid.
Battery Reserve capacity is rated at 105 min at 75 amps.
Load test gave 75 amps for 65 minutes.

Cart will run about 3 on dirt road miles on a full charge. 20.5" tires.
The charge leads should not spark. If they do - they is a short between the receptacle and pack (on either lead, white or black)
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Old 11-01-2017, 04:15 PM   #7
Sergio
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Default Re: PDS acrs when connecting battery terminal

I am no EzGo expert, but doesn't the white charger wire actually powers the entire cart logic system (reed switch in receptacle)?
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Old 11-01-2017, 04:33 PM   #8
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Default Re: PDS acrs when connecting battery terminal

Quote:
Originally Posted by Sergio View Post
I am no EzGo expert, but doesn't the white charger wire actually powers the entire cart logic system (reed switch in receptacle)?
Yes, if it's intact and run/tow is in run.
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Old 11-01-2017, 04:46 PM   #9
rockfordpi
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Default Re: PDS acrs when connecting battery terminal

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Originally Posted by scottyb View Post
Yes, if it's intact and run/tow is in run.
In terms of the arc from the white charger wire. There is also a small red wire coming out of the same bundle as the black and white charger wires. The red wire has a spade connector in it right after it exits the bundle near the batteries. When I disconnect this red wire via the spade terminal, the white wire to charger port no longer arcs when touching to main positive.
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Old 11-01-2017, 04:51 PM   #10
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Default Re: PDS acrs when connecting battery terminal

That's feeding the controller etc again.
But again - if once you hold the wire on the battery for 10 seconds or so....the arc quits when you re-connect, then the caps charging is making the arc.
Once charged there is no arc and this behavior is normal.

Than is how I read your initial post - No?
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