12 volt wiper motors

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   having trouble with both my wiper motors. Thet are wired through a switch that breaks the ground side. They worked fine for over a year. Now they started to smoke. First only one. I took it out of circuit. Then the other started. Hooked both up after checking wires. Ran for 5 mins, smoked the entire time . Didnt blow fuse or get overly hot to the touch.Also they wont shut off. Had to pull fuse. All wires are good. Have ordered 2 new ones (with switces on back of each and will wire separately. But was wondering what would cause this problem. Would wiring them through switch breaking hot side make a difference? The instructions said to wire hot to wiper and break grou d with switch. Thanks in advance for any help given!

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Nobodyjeff5888 Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 27 Mar. 2016 Location: Pennsylvania Status: Offline Points: 880	Post Options Post Reply Quote Nobodyjeff5888 Report Post Thanks(0) Quote Reply Topic: 12 volt wiper motors Posted: 01 June 2019 at 3:46pm
	having trouble with both my wiper motors. Thet are wired through a switch that breaks the ground side. They worked fine for over a year. Now they started to smoke. First only one. I took it out of circuit. Then the other started. Hooked both up after checking wires. Ran for 5 mins, smoked the entire time . Didnt blow fuse or get overly hot to the touch.Also they wont shut off. Had to pull fuse. All wires are good. Have ordered 2 new ones (with switces on back of each and will wire separately. But was wondering what would cause this problem. Would wiring them through switch breaking hot side make a difference? The instructions said to wire hot to wiper and break grou d with switch. Thanks in advance for any help given!

mickeykelley Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 26 May 2016 Location: Republic of Texas Status: Offline Points: 450	Post Options Post Reply Quote mickeykelley Report Post Thanks(0) Quote Reply Posted: 01 June 2019 at 4:52pm
	Shorting out internally would be my guess. Most of these don't really have a good track record. Made in China?

Nobodyjeff5888 Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 27 Mar. 2016 Location: Pennsylvania Status: Offline Points: 880	Post Options Post Reply Quote Nobodyjeff5888 Report Post Thanks(0) Quote Reply Posted: 01 June 2019 at 7:35pm
	probably

Rus Curtis Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 25 Mar. 2010 Location: Alabama Status: Offline Points: 1733	Post Options Post Reply Quote Rus Curtis Report Post Thanks(0) Quote Reply Posted: 01 June 2019 at 7:59pm
	I'd be confused reading directions like that. Unless the body of the wiper is completely insulated I don't really understand the switch on ground side as the entire body/frame/drivetrain is the ground. To me switching on the hot side makes sense - once the power is added, the current is complete through mounting, like everything else. Something is cooking to cause smoke. Your loss of switching off is proof something in the circuitry got destroyed. If you order from a reputable vendor there should be more confidence it would work or if it doesn't, you should be able to return them. For me, I would expect the same results if I bought the same wiper motor to replace the damaged ones.
	Rus Curtis Alabama 1954 CJ3B Bantam T3-C

Nobodyjeff5888 Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 27 Mar. 2016 Location: Pennsylvania Status: Offline Points: 880	Post Options Post Reply Quote Nobodyjeff5888 Report Post Thanks(0) Quote Reply Posted: 13 June 2019 at 6:38am
	purchased different ones from another vender. These have on/off switch on the back of each. I also rewired the dash switch to positive side. They seem to be working ok. Time will tell. Thanks again for all the help.