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Electric Yamaha Electric Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles

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Unread 10-12-2017, 09:06 AM   #1
Not Yet Wild
Join Date: Oct 2017
Posts: 9
Default G9 budget upgrade

Picked up my first cart this week. 94 model G9, 36v. Plan to add lift and new wheels and tires once I get all the drive items taken care of. Cart currently runs, all 6 batteries show 6.7 volts after charging. With the exception of one new Trojan that was added, all the batteries are several years old. I am replacing all the cables with 4g welding cable and plan to load test each battery this evening.

Now my question. I have 8 additional batteries that are 6 volt that came off a scissor lift. I was thinking of adding 2 additional 6 volt batteries to bump me up to 48 volt. From reading on here I believe I will need to upgrade the solenoid and controller from the stock unit. But...I have an old forklift with bad batteries that we were getting ready to scrap. I'm thinking I could pull the solenoid, controller, and possibly the forward/reverse contactor and use it on the cart. Might even migrate the forward/reverse lever from the forklift steering column over to the cart. Thoughts?
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Unread 10-13-2017, 12:57 PM   #2
Not Yet Wild
Join Date: Oct 2017
Posts: 9
Default Re: G9 budget upgrade

Ok. Looks like I will need some new batts. The voltage readings I took was right after charging. After sitting overnight all the batts read 6.0 volts with the exception of the one new one which reads 6.3.

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Unread 01-01-2018, 06:51 PM   #3
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Join Date: Apr 2017
Location: Tampa, Florida
Posts: 4
Default Re: G9 budget upgrade

I'm looking at a 1994 Yamaha electric this week for a build. It appears from your post that you are doing what I intend to do. Have you run into any issues such as parts availabilty or excessively expensive parts for yours? My plan is to add a rear seat, new wheels and tires, heavy duty springs, new batteries and an Altrex controller. Hopefully the motor is still good or I'll replace that as well.
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Unread 01-02-2018, 10:05 AM   #4
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Join Date: Jun 2012
Location: AZ
Posts: 11,196
Default Re: G9 budget upgrade

Since you are going Alltrax controller, you should strongly consider going with a 48v battery pack as well. That alone will get you 33% more speed and torque, not even considering the torque increase from the higher amp controller. Stock motor is compatible with 48v. 48v also opens up options for many 48v clubcar performance motors that are a direct bolt on to your axle. You would also need a 48v charger & solenoid.
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