1990 Marathon potentiometer problems, HPD with Alltrax

[scottyb]

You pot is not good

I haven't told anybody that in 30 yrs

Seriously ! Looks like we found your problem. Your readings won't work with a 0-5k or a 5k-0 unit so which pot do you have? And which controller input do you have?

[marfan2003]

This is what I have exactly like the picture. The website said for EZGO electric 89-94 also.

[rabbitreborn]

That is the unit that should be in there however it is reading WAY out of line.....

It's a PB-16 unit and the readings from it should be 0-5k (approximately). Contact the place you purchased it from and tell them you need a replacement since the one they sent you is out of range.

[marfan2003]

Here's some follow up: For anyone who has this same problem and same readings-- my pot box was wired wrong. I stupidly put the short wires to the F-N-R switch and the long ones to the controller. Switching the two took care of the HPD warning!

It runs now, but slowly. I haven't GPS'd it, but it's slower than I would expect for a 500amp controller and 4G wire. With the DVM set on 20K, The pot starts at 0 and gradually climbs to 5.11. Does the 5.11 mean 5,110 ohms or is this pot still bad? The pack volts are 38.2.

[scottyb]

NO that is a good reading, yes 5.11 = 5110 ohms

You may want to turn that controller down 100 amps to preserve the stock motor.

Going to 48v will now give you 33% more torque and speed.

Congratulations on a successful conversion.