Tuning your RXV for a Lithium Battery

[TheCartBoy]

Originally Posted by kgsc

I’m confused. You said if the signal pin is grounded it disables the controller but then you said when wiring the replacement plug to tie B+ to the signal pin. Wouldn’t that allow the cart to be driven?

It's confusing because the signal pin on the charger plug does not get passed directly to the controller. It essentially gets inverted.

You need + on the charger plug, then when you plug into the cart receptacle, the interlock signal that goes to the controller changes from + to ground. The controller then sees the charger connected.

If you don't connect the signal pin on the charger plug to +, or misconnect it to ground, when you plug into the cart, the interlock signal stays + and controller doesn't know you've plugged in a charger.

Does that make sense?

[TheCartBoy]

Originally Posted by AlexBen

Thank you so much for this. I do in fact have the 4 wire version as you've shown here. Let us call it Modern? I've got my old useless corroded batteries out, and I'm taking stock of the mess that remains. Bought it used, and told "ran when parked".

The black lead above seems to have a resistor or something with a ring termination integral to it for the B(-) stud. The ring terminal is falling off, virtually useless. Does anyone know what that black rectangular box is on the end of the lead? If its a resister anyone know the spec? It's not in a wire diagram so graciously supplied by a member when I asked about the extra unused plug on my dash. (SOC gauge my fleet model lacks)

I want to release the E-brake on this cart so I can roll it. Im hoping a Dewalt 18V battery will suffice, it should. But I want to have all the connections right either way to install the battery bank I'm building.

I think I know what you mean by black box, it's on the grey wire right? Maybe put a photo so we are on the same page.

[kgsc]

Originally Posted by TheCartBoy

It's confusing because the signal pin on the charger plug does not get passed directly to the controller. It essentially gets inverted.

You need + on the charger plug, then when you plug into the cart receptacle, the interlock signal that goes to the controller changes from + to ground. The controller then sees the charger connected.

If you don't connect the signal pin on the charger plug to +, or misconnect it to ground, when you plug into the cart, the interlock signal stays + and controller doesn't know you've plugged in a charger.

Does that make sense?

Leave it to ezgo to complicate things. Thanks

[suzook]

Looking into purchasing a rvx with a lithium conversion. Should I be concerned? Seems like rvx have issues with lithium if not done properly?

[TheCartBoy]

All depends who did the conversion. A bonehead can screw anything up, even a simple oil change... Or lack there of!

Figure out what battery they put in and get the specs. If they put a sh"t battery in, it's not worth paying extra for.

[suzook]

Originally Posted by TheCartBoy

All depends who did the conversion. A bonehead can screw anything up, even a simple oil change... Or lack there of!

Figure out what battery they put in and get the specs. If they put a sh"t battery in, it's not worth paying extra for.

It's a roypow. As far as who did install? No clue. It drove fine down hill at 100% battery, also went up a steep hill with no issues. I'm just concerned about the ebrake issue and bms though. I drove it hard, and nothing seemed out of the ordinary

[AlexBen]

Originally Posted by TheCartBoy

I think I know what you mean by black box, it's on the grey wire right? Maybe put a photo so we are on the same page.

My bad. Looked at it at night.

Yes. Gray wire has the black box. Likely a temp sensor.

Would like to cut it off and put in line a fresh one.

Anyone have a lead for this?

My ring termination off the temp sensor is corroded badly.

[AlexBen]

Correction:


The gray lead above seems to have what I've been told is a temperature sensor with a ring termination integral to it for the B(+) stud. The ring terminal is falling off on mine, virtually useless.

Does anyone know of a suitable aftermarket temp sensor I can splice in with a fresh ring terminal on it?

Thanks in advance.

[TheCartBoy]

Originally Posted by AlexBen

Correction:


The gray lead above seems to have what I've been told is a temperature sensor with a ring termination integral to it for the B(+) stud. The ring terminal is falling off on mine, virtually useless.

Does anyone know of a suitable aftermarket temp sensor I can splice in with a fresh ring terminal on it?

Thanks in advance.

I would just recrimp the ring terminal. I don't see how a temp sensor (or other component) serves a function in parallel with the B+ charge wire, especially when you replace the OEM charger with an aftermarket lithium one. So that said, how about leave grey wire disconnected and let us know what happens?

[AlexBen]

Originally Posted by TheCartBoy

I would just recrimp the ring terminal. I don't see how a temp sensor (or other component) serves a function in parallel with the B+ charge wire, especially when you replace the OEM charger with an aftermarket lithium one. So that said, how about leave grey wire disconnected and let us know what happens?

I have a feeling the ring terminal isn’t drawing power off B+, rather in contact with it to measure its temperature.

The “gray wire” isn’t. It’s sheathing over a red and black apparently.

KGSC says it’s strictly for the charger. Since this is a lithium project, it’s not needed, nor used.