Obc charging question

kgsc · 06-13-2020, 02:09 PM

Forgive my ignorance but how does the obc know that the charger cord gets plugged in? I know grey is the trigger wire for the relay in the charger but how does the obc know when to trigger that wire?

Fairtax4me · 06-13-2020, 02:31 PM

When it senses 48v on the grey wire.
Relay coil positive comes from the Red positive from the pack when the charge cord is plugged in.
That voltage goes across the coil and then back to the OBC on the Grey wire. The OBC detects voltage there and then switches the grey wire to negative to turn on the relay.

kgsc · 06-13-2020, 03:07 PM

Got it. Makes sense. It monitors grey until it “sees” voltage then triggers to pack negative to close the relay. Trying to help someone remotely troubleshoot a cart run and charge issues. Thinking obc might have failed. I will see it tomorrow so we will see. Thank you sir. I still need to get him a 3/8 fuse. His broke so we put in a 1 amp.

kgsc · 06-14-2020, 12:40 PM

Cart I am trying to help with has a no run no charge situation. Asked David about it some and told him the grey charger wire fuse was now bad. Guy broke it trying to get the assembly apart but he told me that wouldn’t cause the no run and to check the fuse in the red wire near the solenoid. Guy can’t find that but the reverse buzzer is working. From looking at the diagram wouldn’t that mean that fuse is good? Any more fuses? Thinking the obc might have bit the dust.

Fairtax4me · 06-14-2020, 12:57 PM

What year is it?
What drive system?

Sure sounds like the OBC took the dirt nap.

kgsc · 06-14-2020, 01:17 PM

95 series

Fairtax4me · 06-14-2020, 01:24 PM

OK, should have a triangle shaped connector going to the OBC with 3 wires in it. On the cart side of the connector Jumper the Yellow wire to the B- terminal of the controller. Yellow is the negative from the solenoid, and should then allow the solenoid to work, and the cart to move.

You can also test the charger function by jumping the Grey wire to pack negative then plug the charger in. It should turn on and at least make some noise.
Those two tests will confirm if the OBC has failed.

kgsc · 06-14-2020, 01:32 PM

Got it. So the buzzer working tells me the fuse is good.. I going to look at it this afternoon and will report back. He may not like the idea of buying a new charger but oh well. Better than replacing the obc

Fairtax4me · 06-14-2020, 01:38 PM

OBC is like $250. A Modz Max charger is about the same.
A Lester Summit II is $350 ish depending where you get it and which cable you put on it.
A little more setup to program the summit II but it's made by Lester, and has a 4 year warranty.

kgsc · 06-14-2020, 01:58 PM

It’s a shame someone hasn’t come up with a board similar to control board in the 36 volt powerwise ezgo chargers made for 48 volt lot of old good obc bound chargers out there

06-13-2020, 02:09 PM	#1
kgsc Gone Wild Join Date: Dec 2009 Location: Aiken, SC Posts: 13,187	Obc charging question Forgive my ignorance but how does the obc know that the charger cord gets plugged in? I know grey is the trigger wire for the relay in the charger but how does the obc know when to trigger that wire?

06-13-2020, 02:31 PM	#2
Fairtax4me Bonafide Nincompoop Join Date: Dec 2015 Location: Charlottesburg Va Posts: 8,987	Re: Obc charging question When it senses 48v on the grey wire. Relay coil positive comes from the Red positive from the pack when the charge cord is plugged in. That voltage goes across the coil and then back to the OBC on the Grey wire. The OBC detects voltage there and then switches the grey wire to negative to turn on the relay.

06-13-2020, 03:07 PM	#3
kgsc Gone Wild Join Date: Dec 2009 Location: Aiken, SC Posts: 13,187	Re: Obc charging question Got it. Makes sense. It monitors grey until it “sees” voltage then triggers to pack negative to close the relay. Trying to help someone remotely troubleshoot a cart run and charge issues. Thinking obc might have failed. I will see it tomorrow so we will see. Thank you sir. I still need to get him a 3/8 fuse. His broke so we put in a 1 amp.

06-14-2020, 12:40 PM	#4
kgsc Gone Wild Join Date: Dec 2009 Location: Aiken, SC Posts: 13,187	Re: Obc charging question Cart I am trying to help with has a no run no charge situation. Asked David about it some and told him the grey charger wire fuse was now bad. Guy broke it trying to get the assembly apart but he told me that wouldn’t cause the no run and to check the fuse in the red wire near the solenoid. Guy can’t find that but the reverse buzzer is working. From looking at the diagram wouldn’t that mean that fuse is good? Any more fuses? Thinking the obc might have bit the dust.

06-14-2020, 12:57 PM	#5
Fairtax4me Bonafide Nincompoop Join Date: Dec 2015 Location: Charlottesburg Va Posts: 8,987	Re: Obc charging question What year is it? What drive system? Sure sounds like the OBC took the dirt nap.

Today
BGW	Sponsored Links __________________ This advertising will not be shown in this way to registered members. Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum

06-14-2020, 01:17 PM	#6
kgsc Gone Wild Join Date: Dec 2009 Location: Aiken, SC Posts: 13,187	Re: Obc charging question 95 series

06-14-2020, 01:24 PM	#7
Fairtax4me Bonafide Nincompoop Join Date: Dec 2015 Location: Charlottesburg Va Posts: 8,987	Re: Obc charging question OK, should have a triangle shaped connector going to the OBC with 3 wires in it. On the cart side of the connector Jumper the Yellow wire to the B- terminal of the controller. Yellow is the negative from the solenoid, and should then allow the solenoid to work, and the cart to move. You can also test the charger function by jumping the Grey wire to pack negative then plug the charger in. It should turn on and at least make some noise. Those two tests will confirm if the OBC has failed.

06-14-2020, 01:32 PM	#8
kgsc Gone Wild Join Date: Dec 2009 Location: Aiken, SC Posts: 13,187	Re: Obc charging question Got it. So the buzzer working tells me the fuse is good.. I going to look at it this afternoon and will report back. He may not like the idea of buying a new charger but oh well. Better than replacing the obc

06-14-2020, 01:38 PM	#9
Fairtax4me Bonafide Nincompoop Join Date: Dec 2015 Location: Charlottesburg Va Posts: 8,987	Re: Obc charging question OBC is like $250. A Modz Max charger is about the same. A Lester Summit II is $350 ish depending where you get it and which cable you put on it. A little more setup to program the summit II but it's made by Lester, and has a 4 year warranty.

06-14-2020, 01:58 PM	#10
kgsc Gone Wild Join Date: Dec 2009 Location: Aiken, SC Posts: 13,187	Re: Obc charging question It’s a shame someone hasn’t come up with a board similar to control board in the 36 volt powerwise ezgo chargers made for 48 volt lot of old good obc bound chargers out there

Similar Threads
Thread	Forum
Question on charging.	Electric EZGO
RXV Charging question	Electric EZGO
Charging question	Electric EZGO
Battery Charging Question (How to keep from over-charging)	Electric EZGO
Charging Question	Electric EZGO