2003 DS series motor lacks power

acurti24 · 05-20-2019, 12:32 PM

Hello to all. I am new to the golf cart world. I purchased a 2003 Club car DS 48 volt series cart for my father in law. He recently had a stroke and can not get around. I thought this would give him some freedom. My problem is it lacks power up hills. I just replaced all the batteries with new ones and I have the same problem. I have check the connections and they are tight. I jumped across the relay to eliminate it and no change. I checked for brake drag, put 25 psi in the tires, etc... My other issue is when in reverse the cart does not move then once at full throttle it will rocket in reverse. Are these issues related? Thanks in advance.

acurti24 · 05-20-2019, 01:20 PM

Sorry. I jumped across the solenoid not the relay.

scottyb · 05-20-2019, 02:14 PM

Any chance this is 36v resistor coil cart?

acurti24 · 05-20-2019, 02:26 PM

To the best of my knowledge it is a 48 volt. Has 6 8 volt batteries, but how do I check?

acurti24 · 05-20-2019, 02:29 PM

The serial number is AA0318-280096

NoleFan4Ever · 05-20-2019, 03:35 PM

That would appear to be a 48v series cart.

Does it have an MCOR underneath on the passengers side? Small black box the pedal linkage connects too? Or is it a V-Gliide (MSP) which is the pie shaped black box between the batteries?

acurti24 · 05-21-2019, 06:17 AM

It has the MCOR. I already added the zip tie to the rod at the pedal to take up some slack. Also I checked the ohms on the yellow and green wire at the controller. I have 11,000 ohms key off pedal up and 1,110 ohms pedal to the floor. I got the wire colors and ohms data from reading other threads on this site. Drove the unit last night with GPS and it goes about 12-13 on flat ground and 9-10 up hills. One big hill with two people it dropped to 7 mph.

NoleFan4Ever · 05-21-2019, 08:56 AM

The MCOR's principle works of a 5 volt loop back to the controller. With the batteries connected, place the black (–) probe on packs main Negative post and the red (+) probe on the yellow wire at the 3-pin connector near the MCOR. (The reading should be approximately ~0.32vdc to ~0.5vdc with the pedal up). Slowly press the Go Pedal and the readings should increase until it reaches ~4.65vdc or more when the pedal is fully pressed. (Anything less than 4.60vdc and you are not reaching full throttle).

If that checks out, we will look at the output from the controller to the motor.

If everything checks out, you will be getting all that cart is capable of....

acurti24 · 05-21-2019, 09:18 AM

Thanks for the information. I will check that tonight and let you know. I am starting to think I just bought a slow golf cart. If everything is working properly then I might send the motor to plum quick. Any thoughts on this with stock controller?

Frizbgolf · 05-21-2019, 10:50 AM

If it is a stock series motor then it doesn't sound like the motor is bad 12-13 mph on a flat and 7-9 mph on a hill is normal. Check the microswitch on the reverse lever and make sure that it is making good contact when in reverse. Sometimes if the microswitch isn't fully making it will lurch like you described. If you want more speed or hill climbing you will have to get another motor. I put the Plumquick bandit in my 03 series DS and could cruise at 20-22 mph on stock controller on flat and 15-17mph on a fairly good hill.

05-20-2019, 12:32 PM	#1
acurti24 Not Yet Wild Join Date: May 2019 Posts: 8	2003 DS series motor lacks power Hello to all. I am new to the golf cart world. I purchased a 2003 Club car DS 48 volt series cart for my father in law. He recently had a stroke and can not get around. I thought this would give him some freedom. My problem is it lacks power up hills. I just replaced all the batteries with new ones and I have the same problem. I have check the connections and they are tight. I jumped across the relay to eliminate it and no change. I checked for brake drag, put 25 psi in the tires, etc... My other issue is when in reverse the cart does not move then once at full throttle it will rocket in reverse. Are these issues related? Thanks in advance.
acurti24 Not Yet Wild Join Date: May 2019 Posts: 8

05-20-2019, 01:20 PM	#2
acurti24 Not Yet Wild Join Date: May 2019 Posts: 8	Re: 2003 DS series motor lacks power Sorry. I jumped across the solenoid not the relay.
acurti24 Not Yet Wild Join Date: May 2019 Posts: 8

05-20-2019, 02:14 PM	#3
scottyb Happy Carting Join Date: Dec 2007 Location: Southern California Posts: 73,406	Re: 2003 DS series motor lacks power Any chance this is 36v resistor coil cart?

05-20-2019, 02:26 PM	#4
acurti24 Not Yet Wild Join Date: May 2019 Posts: 8	Re: 2003 DS series motor lacks power To the best of my knowledge it is a 48 volt. Has 6 8 volt batteries, but how do I check?
acurti24 Not Yet Wild Join Date: May 2019 Posts: 8

05-20-2019, 02:29 PM	#5
acurti24 Not Yet Wild Join Date: May 2019 Posts: 8	Re: 2003 DS series motor lacks power The serial number is AA0318-280096
acurti24 Not Yet Wild Join Date: May 2019 Posts: 8

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05-20-2019, 03:35 PM	#6
NoleFan4Ever MOD of all BS! Join Date: Sep 2011 Location: Florida Posts: 17,477	Re: 2003 DS series motor lacks power That would appear to be a 48v series cart. Does it have an MCOR underneath on the passengers side? Small black box the pedal linkage connects too? Or is it a V-Gliide (MSP) which is the pie shaped black box between the batteries?

05-21-2019, 06:17 AM	#7
acurti24 Not Yet Wild Join Date: May 2019 Posts: 8	Re: 2003 DS series motor lacks power It has the MCOR. I already added the zip tie to the rod at the pedal to take up some slack. Also I checked the ohms on the yellow and green wire at the controller. I have 11,000 ohms key off pedal up and 1,110 ohms pedal to the floor. I got the wire colors and ohms data from reading other threads on this site. Drove the unit last night with GPS and it goes about 12-13 on flat ground and 9-10 up hills. One big hill with two people it dropped to 7 mph.
acurti24 Not Yet Wild Join Date: May 2019 Posts: 8

05-21-2019, 08:56 AM	#8
NoleFan4Ever MOD of all BS! Join Date: Sep 2011 Location: Florida Posts: 17,477	Re: 2003 DS series motor lacks power The MCOR's principle works of a 5 volt loop back to the controller. With the batteries connected, place the black (–) probe on packs main Negative post and the red (+) probe on the yellow wire at the 3-pin connector near the MCOR. (The reading should be approximately ~0.32vdc to ~0.5vdc with the pedal up). Slowly press the Go Pedal and the readings should increase until it reaches ~4.65vdc or more when the pedal is fully pressed. (Anything less than 4.60vdc and you are not reaching full throttle). If that checks out, we will look at the output from the controller to the motor. If everything checks out, you will be getting all that cart is capable of....

05-21-2019, 09:18 AM	#9
acurti24 Not Yet Wild Join Date: May 2019 Posts: 8	Re: 2003 DS series motor lacks power Thanks for the information. I will check that tonight and let you know. I am starting to think I just bought a slow golf cart. If everything is working properly then I might send the motor to plum quick. Any thoughts on this with stock controller?
acurti24 Not Yet Wild Join Date: May 2019 Posts: 8

05-21-2019, 10:50 AM	#10
Frizbgolf Gone Wild Join Date: Nov 2009 Location: Picayune, Mississippi Posts: 881	Re: 2003 DS series motor lacks power If it is a stock series motor then it doesn't sound like the motor is bad 12-13 mph on a flat and 7-9 mph on a hill is normal. Check the microswitch on the reverse lever and make sure that it is making good contact when in reverse. Sometimes if the microswitch isn't fully making it will lurch like you described. If you want more speed or hill climbing you will have to get another motor. I put the Plumquick bandit in my 03 series DS and could cruise at 20-22 mph on stock controller on flat and 15-17mph on a fairly good hill.

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