Wiper Motor Hot to Touch - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bagd72Chevy · 10-12-2017, 05:42 PM

My wiper motor is hot to the touch. Im guessing somekind of internal short. Has anyone else encountered this before?

Thanks,
Ryan

**HO455** · 10-12-2017, 09:29 PM

It could be low voltage to the motor. The voltage is easy to check. There are several threads on troubleshooting wiper motors and switches if you do a search. A bad ground can cause the voltage to be low too.
Or it could be too much resistance from the wiper arms and the bushing through the firewall. (Which I had on my Burban.) The resistance check would require removing the motor and running it disconnected from the arms to see if it runs cooler.

Bagd72Chevy · 10-12-2017, 11:08 PM

Sorry, forgot to mention this was with the switch off. Motor not spinning but it was hot. Hadnt been on all day. No wiper arms installed yet.
Posted via Mobile Device

**HO455** · 10-12-2017, 11:54 PM

That's not a good sign. Sounds like the motor is stuck out of the park position and is trying to get there. I would unplug it now! Have you removed it from the firewall? My firewall bushing was dragging so the wipers were moving at about half speed. Yours maybe worse than mine was.
Another possibility is the brushes in the motor are so worn that the motor can't turn to get back to the park position.

Here is Lockdoc's thread on wiper electrical to help you test the circuitry.

http://67-72chevytrucks.com/vboard/s...d.php?t=413551

10-12-2017, 05:42 PM	#1
Bagd72Chevy C10 Collector Join Date: Oct 2003 Location: Baton Rouge, LA Posts: 417	Wiper Motor Hot to Touch My wiper motor is hot to the touch. Im guessing somekind of internal short. Has anyone else encountered this before? Thanks, Ryan __________________ ///Ryan 1972 Chevy C-10-Bagged, Blown LT1, 700r4, Suicide Doors 1967 GMC- SC & Cam'd 4.8, built 4l80, 3200 stall, posi, 4.10 1967 Chevy LWB- 454 and patina 1971 Blazer - Rusty 1968 Crewcab project

10-12-2017, 09:29 PM	#2
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,270	Re: Wiper Motor Hot to Touch It could be low voltage to the motor. The voltage is easy to check. There are several threads on troubleshooting wiper motors and switches if you do a search. A bad ground can cause the voltage to be low too. Or it could be too much resistance from the wiper arms and the bushing through the firewall. (Which I had on my Burban.) The resistance check would require removing the motor and running it disconnected from the arms to see if it runs cooler. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

10-12-2017, 11:08 PM	#3
Bagd72Chevy C10 Collector Join Date: Oct 2003 Location: Baton Rouge, LA Posts: 417	Re: Wiper Motor Hot to Touch Sorry, forgot to mention this was with the switch off. Motor not spinning but it was hot. Hadnt been on all day. No wiper arms installed yet. Posted via Mobile Device

10-12-2017, 11:54 PM	#4
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,270	Re: Wiper Motor Hot to Touch That's not a good sign. Sounds like the motor is stuck out of the park position and is trying to get there. I would unplug it now! Have you removed it from the firewall? My firewall bushing was dragging so the wipers were moving at about half speed. Yours maybe worse than mine was. Another possibility is the brushes in the motor are so worn that the motor can't turn to get back to the park position. Here is Lockdoc's thread on wiper electrical to help you test the circuitry. http://67-72chevytrucks.com/vboard/s...d.php?t=413551 __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377



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