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Old 08-28-2024, 11:08 AM   #1
Handstjg
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Default 48 volts not present at Battery Terminals

I have a 2023 EZGO RXV Elite. Until the key is turned on there is no voltage present on the battery terminals.

I'm trying to install a wireless cut off relay to prevent theft. It requires that the power wire, that feeds the key switch, provide permanent power to the relay transmitter.

This was an easy task on my 2010 RXV with a ECO Lithium battery, the 48 volts was always present at the battery terminals and on the blue wire that fed the key switch.

Any help would be greatly appreciated.
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Old 08-28-2024, 11:36 AM   #2
TheCartBoy
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Default Re: 48 volts not present at Battery Terminals

Yes because the BMS turns the battery off. Suggest you add a secret kill switch elsewhere.
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Old 08-31-2024, 11:29 AM   #3
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Default Re: 48 volts not present at Battery Terminals

Quote:
Originally Posted by TheCartBoy View Post
Yes because the BMS turns the battery off. Suggest you add a secret kill switch elsewhere.
Thank you for your response.

The more research the more your idea could be my best avenue.

There is a 48 volt line (Brown wire) from the BMS to the key switch, when the switch is turned on it sends a signal back to the BMS via the green wire to wake up the BMS.

I tried using that 48 volt line to power up my wireless relay, but the brown (signal circuit is my assumption) wire does not supply sufficient power to turn it on.

I ordered another wireles relay but I'm not optimistic it will work either.

Thanks again for your help.
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Old 08-31-2024, 11:36 AM   #4
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Default Re: 48 volts not present at Battery Terminals

Yea that's going to be a current limited signal wire only. Probably not a good idea to mess with it at all, at least not trying to pull power off of it.

You can get constant power from the terminals on the underside of the pack. This is where you would attach the bus bars for a second cell module. Going here bypasses the BMS, which is a really stupid idea, I would not recommend it. But I'm going to throw it out there in case someone else discovers that and think it's a good idea.
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Old 08-31-2024, 11:46 AM   #5
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Default Re: 48 volts not present at Battery Terminals

If you want to use the wireless relay, why not use it to break the signal wire from the charge receptacle, and the relay gets power from the normal battery posts when the key is on. So essentially if someone has a duplicate key and turns the cart on, the relay gets power and breaks the charger interlock, this will prevent the cart driving as it thinks the charger is plugged in. To me this the least intrusive signal to mess with.
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Old 09-01-2024, 06:06 PM   #6
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Default Re: 48 volts not present at Battery Terminals

I totally agree about bypassing the BMS and I'm just lucky that I didn't damage anything when I tried the signal wire the first time. The wireless relay dropped the 50.4 volts that was present on the signal wire down to 2.6 volts.

I originally thougt about using the 12 volt power supply that gets turned on once the BMS is "awake" and do as you suggested by interupting the charging port wires. But the relay does not have "dry' contacts. The power source is tied directly to one side of the only relay contact and when closes it uses that same power to provide that voltage to what ever you are switching.

My new thought is back at the key switch the orange wire supplies the 48 volts to the key for power to the forward and reverse relays. I'm going to do a test on how much amperage the wireless relay draws before I take anymore chances.

Thanks again for all your help it is greatly appreciated.

Before anyone ask's "why" I live in Sun City West AZ, in the last 2 years there has been an epidemic of stolen golf carts. Secondly I'm a theif magnet, we have been burglarized 13 times (10 times in AZ but none is SCW) in 54 years and it gets old after the first 4 or 5 times. It's only protection from the honest theives.
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Old 09-02-2024, 07:22 PM   #7
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Default Re: 48 volts not present at Battery Terminals

Thank you Cart Boy for your assistance.

Success, the orange wire did the trick and it works after the key is turned on perfectly.

It's a learning curve, getting used to the turning off the wireless relay before shuting off the Key Switch and turning the wireless relay on after the Key Switch is turned on.

Hopefully it's a short leaning curve, it's all ready a small sense of security.

Thanks again, Tom
Attached Files
File Type: pdf Key Switch Wiring.pdf (73.5 KB, 0 views)
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Old 09-02-2024, 07:35 PM   #8
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Default Re: 48 volts not present at Battery Terminals

I doubt you need to turn the relay off before turning the key off. It's going to kill power anyways.

Glad to hear you got something working to your satisfaction! Good luck out there!
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