# DC Contactor Problem - Needed
**URL:** https://community.electricforum.com/t/dc-contactor-problem-needed/6275
**Category:** GEM Forum
**Created:** [July 28, 2016, 5:17pm UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275 "2016-07-28T17:17:07Z")
**Posts on this page:** 16
**Page:** 1
### Author:  [@harva01](https://community.electricforum.com/u/harva01)
#### Post date: [July 28, 2016, 5:17pm UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/1 "2016-07-28T17:17:07Z")
Hi All, I have a 1999 48Volt Rev2 that has motor shudders issues in forward and will just not get up to any kind of speed. Reverse has plenty of power. Replaced the potentiometer and no change (thanks to all for the part information!). Is the culprit the SW80-684 contactor or perhaps the DC88-271E forward / reverse contactor? Anyone experience the same issue?
I cannot locate either of the above referenced contactors - all help is appreciated.
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### Author:  [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)
#### Post date: [July 28, 2016, 7:16pm UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/2 "2016-07-28T19:16:46Z")
Could be stuck brushes
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### Author:  [@harva01](https://community.electricforum.com/u/harva01)
#### Post date: [July 29, 2016, 3:25am UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/3 "2016-07-29T03:25:57Z")
And how would I go about un-sticking the brushes? The vehicle goes fine down hills and in reverse…
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### Author:  [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)
#### Post date: [July 29, 2016, 6:08am UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/4 "2016-07-29T06:08:26Z")
you have to take the motor apart.
Try this first
Swap the armatures on the motor Reverse will now be forward. If it runs ok then its not the motro if it still shudders then its probably the motor.
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### Author:  [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)
#### Post date: [July 29, 2016, 6:17am UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/5 "2016-07-29T06:17:35Z")
I’m not up to speed on 48 volt carts but a 99 should be 72 volts the last 48 volts were early 98.
Does it have a series motor? The lables on the small wires would be marked S1 and S2 On shunt motors the lables ar marked F1 and F2
Do you have seperate solenoids for forward and reverse? If so can they be swaped?
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### Author:  [@harva01](https://community.electricforum.com/u/harva01)
#### Post date: [August 1, 2016, 4:04am UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/6 "2016-08-01T04:04:47Z")
Attached are photos of the motor and contactors. Can you offer a direction on the easier way to reverse the motor as you suggested on your response?
Thanks.
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### Author:  [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)
#### Post date: [August 1, 2016, 6:08am UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/7 "2016-08-01T06:08:28Z")
Reverse the armature leads on the motor
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### Author:  [@harva01](https://community.electricforum.com/u/harva01)
#### Post date: [August 1, 2016, 6:41am UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/8 "2016-08-01T06:41:50Z")
So: S-1 to S-2 and A-1 to A-2 (and of course A-2 to A-1 and S-2 to S-1)?
Many thanks.
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### Author:  [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)
#### Post date: [August 1, 2016, 6:51am UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/9 "2016-08-01T06:51:56Z")
No
Only A1 and A2
If you switch both sets rotation will not change
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### Author:  [@harva01](https://community.electricforum.com/u/harva01)
#### Post date: [August 1, 2016, 7:15am UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/10 "2016-08-01T07:15:00Z")
Thank you sir, will do and if motor is bad - do you sell replacements?
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### Author:  [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)
#### Post date: [August 1, 2016, 7:20am UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/11 "2016-08-01T07:20:37Z")
I do but don’t have any series motors.
I charge $125 to service a motor if it’s repairable. Plus postage both ways
Rodney
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### Author:  [@harva01](https://community.electricforum.com/u/harva01)
#### Post date: [August 2, 2016, 4:21am UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/12 "2016-08-02T04:21:16Z")
Swapped the leads and it again shudders / will not get up to any speed. Brushes must be shot. Appreciate all of the advice and assistance.
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### Author:  [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)
#### Post date: [August 2, 2016, 5:17am UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/13 "2016-08-02T05:17:42Z")
There is a 2.6HP motor on Ebay to fit your 48 volt car.
Did you check your brakes for dragging? Jack up all 4 corners.
Rodney
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### Author:  [@harva01](https://community.electricforum.com/u/harva01)
#### Post date: [August 2, 2016, 6:43am UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/14 "2016-08-02T06:43:31Z")
I did. Wheels move freely. Motor “bucks” with accelerator depressed. Fine at very low speed…
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### Author:  [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)
#### Post date: [August 2, 2016, 8:24pm UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/15 "2016-08-02T20:24:01Z")
You better quit and repair/change out the motor before you lunch the control
Rodney
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### Author:  [@harva01](https://community.electricforum.com/u/harva01)
#### Post date: [August 3, 2016, 2:51am UTC](https://community.electricforum.com/t/dc-contactor-problem-needed/6275/16 "2016-08-03T02:51:16Z")
Will do and appreciate all the advice. Great forum.