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Electric Club Car Electric DS, and Precedent golf cars



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Unread 01-03-2016, 02:15 AM   #1
Not Yet Wild
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Default OBC Help '09 Precedent

So I thought my charger was bad but ruled that out today by checking it on a working system. Cart runs and has 48.6V but charger won't kick on. If the charger is good does that just leave the OBC? How do I test the OBC? Or do I just replace it? Thanks for any help.
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Unread 01-03-2016, 05:44 AM   #2
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Default re: OBC Help '09 Precedent

Disconnect your main pack negative cable from the battery and wait about 10 minutes this will reset the OBC. Check to see if cart will now charge.
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Unread 01-03-2016, 09:32 AM   #3
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Default Re: OBC Help '09 Precedent

try resetting the OBC

Resetting the Club Car On board computer - reset the OBC

To reset the OBC the following must be done in this order:

If no Tow/Run Switch then skip that step

• Key Switch to Off
• Forward/Reverse to Neutral
• Tow/Run Switch to Tow
• Disconnect the Battery NEGATIVE (–) wire from the Battery Minus terminal on the battery pack.
• Put the Tow/Run to Run
• Forward/Reverse Switch to Reverse
• Key Switch to On
• Press the throttle pedal down (hold it to the floor)

The reverse buzzer will sound (sometimes) and go off in about 30 seconds.
Leave the cart like that for 5 min to cause the OBC to reset.
After 5 min release the throttle pedal

To reconnect the OBC back into the system:
• Key Switch to Off
• Forward/Reverse Switch to Neutral
• Tow/Run switch to Tow
• Reconnect the Batt – wire to the battery minus
terminal on the battery pack.
• Tow/Run switch to Run
• Key Switch to ON

if you have no luck with obc reset then try jumping the obc

to by pass OCB
DO AT YOUR OWN RISK.…do not attempt unless you are familiar with electricity and electronics!
There are two ways to force the charger to turn on regardless of the OBC.

The first method is to disconnect the cart’s gray wire at the fuse near the charger receptacle.
Then using a jumper wire, connect the receptacle side of the fused connector to the cart’s negative battery terminal.
This will energize the charger’s 48V relay.
If the charger doesn’t come on, it could be bad connections, wiring or charger relay.


second step skipped

Both of these methods should both be temporary measures for troubleshooting, or as an emergency method of charging the batteries
when they have been discharged so far that the OBC will not charge them.

The OBC provides the optimum method of charging the cart’s batteries. If the OBC is bad, it should be replaced
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Unread 01-03-2016, 11:18 AM   #4
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Default Re: OBC Help '09 Precedent

The method teecro posted is the correct one for Resetting the OBC on a Precedent (or any other Sepex drive system).

If You do the OBC circuit activation by-pass posted by crash test dummy (note: there will be no fuse in your Gray sense wire) and the charger turns ON:
1) Do not leave it unnattended as the batteries will overcharge.
2) The most likely reason for a blown OBC activation transistor is a bad suppression diode in the external powerdrive charger.
If that is the case, do not use that charger on Your cart (with a new OBC) or any other friends cart until You test/replace the voltage suppression diode in the charger relay or You could damage another OBC.
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Unread 01-03-2016, 11:45 AM   #5
Not Yet Wild
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Default Re: OBC Help '09 Precedent

Thanks for all the quick responses. I tried resetting the OBC before anything else but that didn't help. I checked the charger relay by plugging into the cart, hearing an audible click and verifying the relay closed with an ohm meter.

Sergio, is the suppression diode on the relay board or do I just replace the relay? If it's on the board, can you tell me how to test it?

If that is the case, do not use that charger on Your cart (with a new OBC) or any other friends cart until You test/replace the voltage suppression diode in the charger relay or You could damage another OBC.[/QUOTE]
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Unread 01-03-2016, 12:37 PM   #6
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Default Re: OBC Help '09 Precedent

I assume the relay test You performed was on another cart and that the charger never "clicks" on your cart.

The Powerdrive3 has a TVS diode on the Relay assembly board instead of a regular diode like the older models.

Disconnect both the AC and DC plugs of the charger.

Set your MultiMeter to the diode test mode.
Put the negative probe on the "Sense" pin (short pin) of the DC plug.
Put the positive probe on the "+" pin of the DC plug.
The meter should ready around 1.5v (1.1v to 1.8v) if the relay board assembly is working properly.

A reading of 0.5v or OL would indicate a failed TVS diode.
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Unread 01-03-2016, 12:53 PM   #7
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Default Re: OBC Help '09 Precedent

No, I tested the relay on my cart. I have over 48v. The relay is open then when I plug in the cart, after about 5 seconds I can hear the relay click then testing acros the relay it's closed. Does that mean the OBC is actually working?

Again, the cart runs and it's telling the relay to close. The charger just never starts.
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Unread 01-03-2016, 01:32 PM   #8
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Default Re: OBC Help '09 Precedent

What is the voltage between the positive and negative socket as measured at the cart charger receptacle?
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Unread 01-03-2016, 01:35 PM   #9
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Default Re: OBC Help '09 Precedent

There are no fuses on the charging system on a Precedent. If all of the connections are good within the charger receptacle, on the back of the OBC, and on the main positive battery post, then it's safe to say the OBC has failed.
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Unread 01-03-2016, 08:32 PM   #10
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Default Re: OBC Help '09 Precedent

Discovered the reel out cord I had been using is intermittently bad. Made room near another outlet and everything works as it should. Thanks again for all the responses. Lesson learned.
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