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Unread 05-04-2012, 12:46 PM   #11
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Default Re: 1993 marathon solenoid clicking cart wont go

So your telling me that I don't have enough voltage to turn wheels with cart rear jacked up
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Unread 05-04-2012, 02:59 PM   #12
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Default Re: 1993 marathon solenoid clicking cart wont go

I am charging batteries now from m- to b- I have full battery pack
Voltage as soon as pedal is pushed as I go to the floor ?voltage only
Falls 6volts. What's that mean.
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Unread 05-04-2012, 08:42 PM   #13
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Default Re: 1993 marathon solenoid clicking cart wont go

alright i have 38 volts on battery pack and still no go

m- to b- i have full voltage and when gas is mashed with key on and fnr in forward i have about 32 volts l when all the way to the floor

i have full battery pack voltage blue wire on controller

i have 0 -5700 ohms on black and white wire on controller

M- to b+ when gas is mashed i have no voltage
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Unread 05-05-2012, 05:50 AM   #14
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Default Re: 1993 marathon solenoid clicking cart wont go

Quote:
Originally Posted by snake91876 View Post
So your telling me that I don't have enough voltage to turn wheels with cart rear jacked up
No, not exactly, but maybe. It is always best to troubleshoot with a fully charged battery pack.
35.8V indicates your battery pack has less than a 40% charge or has one or more bad cells.
Having a fully charged battery pack, is the first step in eliminating it as a problem source.
Measuring pack voltage and individual battery voltages while cart is misbehaving, are the next steps in eliminating the batteries for the list of suspects.


Quote:
Originally Posted by snake91876 View Post
I am charging batteries now from m- to b- I have full battery pack
Voltage as soon as pedal is pushed as I go to the floor ?voltage only
Falls 6volts. What's that mean.
It means that the MOSFETs are being told to conduct, but aren't.


Quote:
Originally Posted by snake91876 View Post
alright i have 38 volts on battery pack and still no go

m- to b- i have full voltage and when gas is mashed with key on and fnr in forward i have about 32 volts l when all the way to the floor

i have full battery pack voltage blue wire on controller

i have 0 -5700 ohms on black and white wire on controller

M- to b+ when gas is mashed i have no voltage
The conditions needed for controller to pass Amps to motor have been met.
The controller is being told to pass Amps to motor.
The controller is not passing Amps to motor.
My guess is that the controller is bad.
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Unread 05-05-2012, 06:19 AM   #15
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Default Re: 1993 marathon solenoid clicking cart wont go

How can I jump controller to make sure motor is good before spend this money. Can I jump b+ to m- terminal on fnr switch or what. Thanks for the help.
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Unread 05-05-2012, 06:58 AM   #16
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Default Re: 1993 marathon solenoid clicking cart wont go

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Originally Posted by snake91876 View Post
How can I jump controller to make sure motor is good before spend this money. Can I jump b+ to m- terminal on fnr switch or what. Thanks for the help.
That would explode the batteries.

If I was going to do it, I'd jump from B- to M-. It is between those two terminals that the controller actually controls the current flow through motor.

Be very careful. Make sure the cart is jacked up and securely blocked. That motor is going to get hit with every amp your battery pack is capable of producing and may arc weld jumper to terminals, so have an insulated sledge hammer handy to knock it off before the motor accelerates to destruction.
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Unread 05-05-2012, 08:42 AM   #17
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Default Re: 1993 marathon solenoid clicking cart wont go

These are 2 excellent answers JohnnieB


FYI You can pick up a battery disconnect for $5 at harbor freight and use this simple test below for series motors with the disconnect as the final connection. Works very well. Notice the test is done with just 18v. I keep one of these in the shop. http://www.harborfreight.com/heavy-d...tch-66789.html
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File Type: jpg Series motor test.jpg (18.5 KB, 0 views)
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Unread 05-05-2012, 11:38 AM   #18
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Default Re: 1993 marathon solenoid clicking cart wont go

Using full pack voltage to test a motor is not a great idea! As John said, things can go very wrong!
When using Scott's diagram, make sure you label all of your motor cables before you remove them. You will need a thin wrench to hold the nut next to the motor. If you don't hold this nut in place you will spin the entire stud, breaking the internal connections in the motor! Also, the disconnect shown is away from the batteries on purpose. You want no arcing anywhere near the batteries! ( another explosion hazard )
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Unread 05-05-2012, 07:20 PM   #19
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Default Re: 1993 marathon solenoid clicking cart wont go

ok so i did scottys test and sure enough the motor took off spinning as soon as i made contact. So can i be 100% sure it is the controller now.
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Unread 05-06-2012, 09:42 AM   #20
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Default Re: 1993 marathon solenoid clicking cart wont go

Quote:
Originally Posted by snake91876 View Post
ok so i did scottys test and sure enough the motor took off spinning as soon as i made contact. So can i be 100% sure it is the controller now.
99.9% There are no absolutes.
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