Melex 252 resistor speed control

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Yanknrebel

New Member
I have a Melex 252 I just purchased, non running, after some cleanup, I fount the speed contol burnt up along with two of the resistors. Replacing the parts wont be a big deal, I need to know if I should be looking for something that caused this to happen, or will just replacing the board and resistors do the trick? Any help or comments will be greatly appreciated! Thanks!
 
The most common cause for the board and resistors to burn is a bad contact. Replacing them should cure the heat problem.
 
Thanks! The last contact is completely burned off, and the second to last isnt far behind. Gonna get the parts ordered Friday.
 
here is a pic of the board
10-21-09_1052.jpg
 
Ordered the parts earlier today(new cables too). Hooked a car battery to motor and it seems to run alright. Thanks again for your help!
 
I think I finnaly got to the bottom of the problem. I went Sat. and picked up the batteries from the guy I bought the cart from. It was raining and nasty, so we loaded them, and I took off. When I unloaded them this morning, I realized they are 8v batteries. so he was running 48v in this 36 v cart. I would guess this would explain the burnt control board. So, now I have to either find someone who wants to buy used 8v batteries, or lay out more cash for some 6v batts. Is it possible to convert it over to 48v? which parts would need to be changed? Just aint got no more $$ for batteries. HELP! LOL! Appreciate any input!
 
Most resistor carts will handle 48 volts without any problems. The overheating may have been caused from bad connections and old parts. Now that you replaced the board and resistors it may be fine running 48 volts. Keep a eye on things and make sure nothing is overheating if you decide to run it on 48 volts.
 
UPDATE: I got tied of tryin to find a good deal on sone 6v batteries, so I wired her up with 3 12v car batteries(free). So far so good, they have been in there a week, and I try to dive it around the dealership here @ lunchtime some every day. Havent needed to charge them yet, but I did hook up the charger to be sure it worked. I think I'm gonna try to make the season on these, has anyone had any experience with how long they might hold up? Just dont want to drop the $$ for new batteries until I'm sure nothing else on "Big Orange" is gonna lay down. On a side note, anyone know how to get the rear brake drums off? I tried for about 45 mins, with no luck. Either I'm missing something or they are corroded to the hubs pretty tight. Thanks again for all the Advice, it was a major help!
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Hello, The car batteries are not "deep cycle" and will not last long in that application. Also while you have 36 volts you don't have the reserve capacity you get with 6- 6volt batteries. So you will get alot less travel time between charges. I agree the cart can handle 48 volts if all wiring is in good shape. Also the big solenoid by the speed board should by a 48 volt if your going to go that route. After you ride it around awhile. Check your wiring for heat. Warm is OK hot is not. Check the wire coming from the reversing switch to the speed board. I had one burn up there due to a bad contact in the reversing switch. I was wondering what volt charger you have since it came with 8 volt batteries. I fixed up a old 252 cart for my daughter to use at our camp and she loves it. I'll try to post a picture

Robbie

 
Hey thanks! The cart is doing ok on the car batteries for now, it just lugs pretty good on the hills. We used it for the better part of two days last weekend, with several trips to the pool and back as joyrides for the kiddos. It held up well, except on the hills where it slowed very noticeably. If it can hold up for our normal 2 day at a time usage for this season, that will be great for us. It will get new batteris next spring at the latest. I spoke to the guy I bought the cart form, he said he just ran 5 of the 8 volt batteries at a time. The charger is a 36 v unit, so I think Im gonna leave it 36, and just put the 6 volters in when these car batteries kick over and die. Thanks for all the advice, we are loving having the cart running!
 
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