help! .....wiper problem!........ help!

[yote1234]

im going crazy trying to figure out the problem..im finishing a complete body off restoration of my 72 cheyenne hugger 1/2 ton truck.installed nos wire harness,all brand new gm stuff. ...... so i installed the new wiper motor and it doesnt work.? i re installed the old one and it doesnt work. i removed the old one and tried to bench test it. when i turn the shaft then touch the wires to it (hot/ground) it starts up and runs the shaft 1/2 turn,i turn the shaft back 1/2 turn and touch the wires to it again it will turn 1/2 turn again. so i figured out the 1/2 turn is only a "return", but i cant get it to make a complete round. it is a 2 termanal plus ground. i have nos wire/fuse/switch/motor.
im still in dash assembly stage. ............. any ideas?

[Longhorn Man]

the wiper should have constant hot, and is turned on by adding the ground. That may be the problem on the bench test.

[peglegs]

yote this might answer your questions

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

[67sss]

not that i have a answer for you but here's a few pics of a old wiper motor i have laying around. Now you'll have a reference to go by. good luck!

[yote1234]

Originally Posted by Longhorn Man

the wiper should have constant hot, and is turned on by adding the ground. That may be the problem on the bench test.

i grounded it by the batt neg .??

Originally Posted by peglegs

yote this might answer your questions

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

great info......... big thanx,dave

Originally Posted by 67sss

not that i have a answer for you but here's a few pics of a old wiper motor i have laying around. Now you'll have a reference to go by. good luck!

yes, same type as mine...thx,dave

[peglegs]

yote i have a similiar problem with mine also mine just stopped and i followed the bench test in the thread above and its ok ire=installed and nothing again. i wont drive it much in the winter so its sitting till i work on it again. on another thread mentioned about a "ground strap" from the motor to the firewall to ground the motor. below is another helpful thread.

http://67-72chevytrucks.com/vboard/s...d.php?t=435162

and another
http://67-72chevytrucks.com/vboard/s...archid=2039313

[peglegs]

from the w/w motor to a scew close by, as i understood it thats how the w/w motor is grounded to work as it mounts are rubber but this info may be year specific i have a 67 and didnt find any, another said that the switch acts as a ground when you turn your knob the ground takes effect hope others will give their opinion on this ground thing im not a pro at all this myself just trying to help out here, good luck

[71 super]

Is the strap coming off the wiper motor to the upper screw in place? Be sure the ground is pluged in and have you tested with test light to see if you are getting power flow through the wiring harness? I had problem with 68 and actually had bad wiper motor, would wiggle, but nothing else, left it on for few seconds and it got red hot (litterally). Be careful, it can burn your new resto down.

[yote1234]

Originally Posted by peglegs

from the w/w motor to a scew close by, as i understood it thats how the w/w motor is grounded to work as it mounts are rubber but this info may be year specific i have a 67 and didnt find any, another said that the switch acts as a ground when you turn your knob the ground takes effect hope others will give their opinion on this ground thing im not a pro at all this myself just trying to help out here, good luck

i will look into the grounds.. kinda think your right... will look tomorrow... thx,dave

Originally Posted by 71 super

Is the strap coming off the wiper motor to the upper screw in place? Be sure the ground is pluged in and have you tested with test light to see if you are getting power flow through the wiring harness? I had problem with 68 and actually had bad wiper motor, would wiggle, but nothing else, left it on for few seconds and it got red hot (litterally). Be careful, it can burn your new resto down.

yes,ground is on the upper screw.and power is at the motor,and its the 2nd motor. original one worked fine before tear down...? think i will check all the grounds..frame to body,also. lots of fresh paint! thx dave