lifted club cars - lifted ezgo
Home FAQDonate Who's Online
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Electric golf carts
Electric golf carts Harley Davidson, Melex, Pargo, Taylor-Dunn and other Misc. Carts.



Post New Thread  Reply
Thread Tools Display Modes
Unread 07-26-2009, 08:59 PM   #1
Not Yet Wild
 
Join Date: Jul 2009
Posts: 5
Default Help please: Controller problems after replacing batteries in a 36v melex

I am a new member... and stumped with an electrical problem on my Melex cart! Can new batteries break a controller? Or is it possible that a controller could still run at a lower voltage if it was/is defective?

Here's the background:

I have a Melex 512 (yes, I know it's not the main-stream and rather old) and I have been running it for quite some time with batteries that were holding less and less charge... clearly, they were on their last leg... anyway, a short while ago it also had a "dead" spot in the throttle so I followed the threads here and found it to be a defective pot... went to my local electrical store and replaced the pot and viola... I was running again.

So thrilled with the first repair, I went out and forked out the bucks for new batteries, (since I got it working "normally" again...) but now it won't run at all... UNLESS I change the battery config to 24 volts. At first, I thought I just had a battery with a bad cell so I figured I would remove them a pair at a time to speed up troubleshooting, but when I removed the first pair the cart started moving again. Doesn't matter which pair I take out, so long as it's 24v configuration I can run.

Any ideas why my cart will run at 24v but not at 36? Is there any adjustments I can make to the controller?

From what I can tell it's a Curtis 1204 or 1205 (not sure which is which) and I haven't pulled the controller from the cart to get the serial/model number.

Any assistance or ideas are greatly appreciated! I don't have a ton of $$ to just replace everything and it sucks that I already dumped a ton into the new batteries only to find I have a new problem.
kryten_007 is offline   Reply With Quote
Alt Today
BGW

Golf car forum Sponsored Links

__________________
This advertising will not be shown in this way to registered members.
Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum
   
Unread 07-26-2009, 11:36 PM   #2
nimda
Club Car
 
Join Date: Jun 2007
Posts: 12,922
Default Re: Help please: Controller problems after replacing batteries in a 36v melex

May sound dumb but are you SURE they are 6 volt batts? (it has happened before)
roady89 is offline   Reply With Quote
Unread 07-26-2009, 11:46 PM   #3
Not Yet Wild
 
Join Date: Jul 2009
Posts: 5
Default Re: Help please: Controller problems after replacing batteries in a 36v melex

Yes, definitely 6v (Trojan T105's).
kryten_007 is offline   Reply With Quote
Unread 07-29-2009, 05:48 AM   #4
Not Yet Wild
 
Join Date: Jul 2009
Posts: 5
Default Re: Help please: Controller problems after replacing batteries in a 36v melex

Finally figured it out...

Turns out the resistor/diode in the throttle was bad making the ground float... thus getting about 20v at the 0-5k ohm pot input at the controller when the batteries were at full charge which I guess was putting the controller in the high-speed-disable at startup.

That's why it worked when the voltage was lower and not with the new batteries.

Took forever to figure out, but if anyone else is in the same situation, check all the items in the pot box and not just the items that are "obviously" bad
kryten_007 is offline   Reply With Quote
Reply

Tags
controller problem, melex 512, new batteries
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Electric golf carts


Thread Tools
Display Modes


Similar Threads
Thread Forum
Melex 252 brake problems (pics) Electric golf carts
I need a Controller for a Melex 512 E Golf Carts and Parts
Melex with SIX 12 volt batteries Melex
Extra batteries in a Melex?? Melex
Melex batteries draining w/o use Melex


All times are GMT -5. The time now is 12:55 AM.


Club Car Electric | EZGO Electric | Lifted Golf Carts | Gas EZGO | Used Golf Carts and Parts

Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.