Yamaha drive won't drive

[Sulli017]

48v drive has about 50v at the pack. I can hear the click when switching from tow to run, I hear a second click with the switch. When gas pedal is hit I get one small effort from the cart then it quits on me, the effort just rocks the tires slightly, no real movement.
I have had charging trouble in the past but my pack is reading correctly, color me confused!


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[yamahaguy97]

Hey



Something still may be wrong with batteries. How old are they? Can you load test them to be sure they are really good


-steve

[yamahaguy97]

A lot of people think because you put a volt meter on batteries and it shows the right voltage that the batteries are ok but it does not mean they can handle the load until a load discharge test is done first

[cgtech]

sounds like solenoid problem to me. yes, it clicks, that is good sign. but that doesnt guarantee thats it's working good. clip your meter probes to the controller terminals B+ and B- then test again during the failure of when is tries to go. if the voltage drops, and isnt stable like "pack voltage" its a solenoid problem.

[Sulli017]

Originally Posted by yamahaguy97

A lot of people think because you put a volt meter on batteries and it shows the right voltage that the batteries are ok but it does not mean they can handle the load until a load discharge test is done first

I'm handy, but new...how does one do a load test? My batts are 4 years old and have been cared for, I believe I should get more out of them but don't know.


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[Sulli017]

Originally Posted by cgtech

sounds like solenoid problem to me. yes, it clicks, that is good sign. but that doesnt guarantee thats it's working good. clip your meter probes to the controller terminals B+ and B- then test again during the failure of when is tries to go. if the voltage drops, and isnt stable like "pack voltage" its a solenoid problem.

I have not ever been able to locate a service manual for this cart, do you know where I can find one? I'm not sure where/how I access the controller...or is it obviously just behind the tow/run switch? Thanks


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[yamahaguy97]

Originally Posted by Sulli017

I'm handy, but new...how does one do a load test? My batts are 4 years old and have been cared for, I believe I should get more out of them but don't know.


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you buy a load tester, you can get it at harbor freight, connect each alligator clip to each pos and neg of battery terminal and you will press a button or lever and hold it for a few seconds at a time and it will show you if a battery drops significantly enough to tell you its bad

[yamahaguy97]

your right that batteries at 4 years old can still be ok, but usually they will not after that time. some batteries go bad after several months old especially if you run them dry and do not keep them filled with water

[RodStarr]

Did you get this resolved? I have the same issue.

[Frizbgolf]

If you don't have access to a load tester, you can clip your meter leads to the pack positive and negative posts and read the voltage drop on the meter when the pedal is pushed.