This cart belong to a buddy of mine and today I switched out the old lead acid batteries for some lithium batteries. I also added a dc converter and wired it to turn on and off with his key switch. This was a simple install and if you have a ezgo txt pds cart then this is what you can expect.
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Dc Converter - https://amzn.to/46QqUkg
36v Relay - https://amzn.to/3SgcWne