High speed only

canoehenge

New Member
Greetings from central Texas,

I am new to this forum and have done extensive exploring and reading at this and other forums. By way of introduction, I have a long work history as an auto mechanic, hot rodder, industrial maintenance, machinist, welder, instrumentation & controls technician, etc, etc. I have had a lot of experience working on and rebuilding electric fork lifts and industrial buggies.

I just recently acquired my first golf cart, a 1992 ExGo Marathon electric with the FS Series controller, Curtis 1204-001 275A 36V. The problem I am having is the lack of speed control, only high speed in forward and reverse. Everything else checks out, all wiring is ok, microswitches are working, batteries hot, all connections good, solenoid is working, 36V to control terminal 1, and the potentiometer is good.

A word about the 0-5k pot, this particular setup has a fixed resistor that limits resistance to about 2.8k when in reverse, hence limiting speed. When in forward the full range of the pot is actually 0-7k when in forward. At any rate, I know that the controller is, first: getting 36V to terminal 1 and two: getting the variable resistance reference to terminals 2 & 3.

At this point what I need is a detailed test procedure for the controller itself, as every other component is work properly, unless I have missed something. Any help that can be provided would be appreciated.

Thank you,

Bert
www.canoehenge.com
www.radiofreetexas.org
 

HotRodCarts

Cartaholic
Welcome to the forum.

When you tested the pot. did it go from 0 to 5k smoothly as you slowly pressed the accelerator?
 

HotRodCarts

Cartaholic
Well that really only leaves the controller as being the problem. Did this cart ever run right since you've had it? And you're sure you have the right controller in the cart, 0-5k not 5k-0?
 

canoehenge

New Member
I just recently acquired it. The previous owners stated that they could not drive it since it quit having any speed control, only high speed. I presume that the controller has never been changed. It appears to be the right controller, Curtis 1204-001, ExGo #20972-G2, although I have not removed it, yet.

Bert
 

HotRodCarts

Cartaholic
Ok, that's the right controller for the cart. Have you looked at a wiring diagram to make sure the cart is wired correctly? If it's wired right and the pot box is working correctly I'd say you have a bad controller.
 

canoehenge

New Member
10-4 I have the correct wiring diagram and all other components test good with good connections, so it looks like I have a bad controller.

Bert
 
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