racking my brain

Tech tips and how to's

Moderators: notoptoy, garth, S Allen

User avatar
dads311
Roadster Newby
Posts: 21
Joined: Sun Dec 04, 2016 9:24 pm
Location: Emmett, Id.

racking my brain

Post by dads311 » Sun Apr 15, 2018 9:16 pm

Brief history. 67.5 was my dads years ago, got it back and restoring it. PO used hacksaw and garden shears to remove wiring but he saved all the pieces???
Current problem I hope someone can confirm my diagnosis. Wiper motor works perfect, 2 speed with park. Washer didn't work. Pulled the schematic back out compared my wiring, slapped myself a couple times, fixed it so it should work. nope. with key on I get power to the washer motor, if I ground the wire it sprays like crazy. If I hook it back up to go to the switch nothing. Wire from washer to switch tests good with ohm meter.
In the picture next to the A is where the ground wire for the washer comes in. Using the ohm meter I can not find where that would ground or connect when I turn the knob. With the wire just dangling in the engine compartment the wipers still work perfect. I suspect my switch is bad. I can hear and feel things moving when I turn it but I get no connection anywhere. Does a bad switch sound right?
I have this and the back up lights to fix and I think all of my gremlins will be taken care of. I did install and ezwire 12 fuse harness but spent considerable time piecing all of the original wiring back together just to be sure what powered what. I have been sick for 2 weeks and felt good enough to go out and work on it today, maybe I shouldn't have. Anyway let me know if I forgot to check something or if my conclusion is correct.
You do not have the required permissions to view the files attached to this post.
Last edited by dads311 on Mon Apr 16, 2018 11:57 am, edited 1 time in total.
Mike
rebuilding dads 67.5 spl311
1952 GMC 302ci 6cyl w/cam and 3 deuces
1965 Mustang (Wife's)
1971 Nova (Son Claimed)

User avatar
datsun1500
Roadsteraholic
Posts: 1144
Joined: Wed Sep 19, 2007 8:24 pm

Re: racking my brain

Post by datsun1500 » Sun Apr 15, 2018 9:44 pm

Screw the switch to the dash and see what happens. I’m pretty sure it grounds that way. Easy test would be just touching the switch casing to the dash.
If you have to keep telling me how cool your car is, maybe it's not that cool.

User avatar
redroadster
Roadsteraholic
Posts: 765
Joined: Tue Mar 12, 2013 10:58 am
Location: KCMO

Re: racking my brain

Post by redroadster » Sun Apr 15, 2018 10:46 pm

You can bend the tabs up to see the swt operation

User avatar
boxcar
Roadster Nut
Posts: 33
Joined: Thu Mar 15, 2018 12:56 pm
Location: Astoria oregon USA

Re: racking my brain

Post by boxcar » Mon Apr 16, 2018 10:51 am

I'm pretty sure everything ( switches ) grounds through the dash. Ground the switch body as a test.

User avatar
dads311
Roadster Newby
Posts: 21
Joined: Sun Dec 04, 2016 9:24 pm
Location: Emmett, Id.

Re: racking my brain

Post by dads311 » Mon Apr 16, 2018 12:05 pm

Thanks for the replies and suggestions. I checked using the ohm meter with the positive lead on the connection at A in the picture and the negative on the case. Nada, nothing. I assumed and your suggestions seem to confirm it grounded through the case. I then thought it might , for some unknown reason, go through the switch all the way back to the wiper motor, can't find a connection anywhere for that either. I guess if I open the switch I will figure out what it is supposed to do and then the way my luck runs with this car I will order a new switch cause I'll never get it back together in operational condition. But I will know what it is supposed to do. lol
Thanks again
Mike
Mike
rebuilding dads 67.5 spl311
1952 GMC 302ci 6cyl w/cam and 3 deuces
1965 Mustang (Wife's)
1971 Nova (Son Claimed)

User avatar
dads311
Roadster Newby
Posts: 21
Joined: Sun Dec 04, 2016 9:24 pm
Location: Emmett, Id.

Re: racking my brain

Post by dads311 » Mon Apr 16, 2018 2:01 pm

Fixed it!! inside the switch there is a piece of metal that moves when the switch it turned to initiate the washer. It has contacts on it like a voltage regulator. It was fried completely black making no contact. Emery cloth cleaned it right up. Interestingly enough when it makes contact it sends the ground signal all the way down to the wiper motor.
The first picture shows the little spring loaded cog that moves the little piece of metal at the top of thesecond picture. This makes a connection with the ground wire back to the wiper motor. I took everything apart, cleaned it as best I could, applied a light coat of dielectric grease where appropriate and put it back together. Works like new.
You do not have the required permissions to view the files attached to this post.
Mike
rebuilding dads 67.5 spl311
1952 GMC 302ci 6cyl w/cam and 3 deuces
1965 Mustang (Wife's)
1971 Nova (Son Claimed)

User avatar
boxcar
Roadster Nut
Posts: 33
Joined: Thu Mar 15, 2018 12:56 pm
Location: Astoria oregon USA

Re: racking my brain

Post by boxcar » Mon Apr 16, 2018 6:47 pm

Cool beans man. Thanks for the wright up. If I ever have the same problem I will now have a solution.....

User avatar
redroadster
Roadsteraholic
Posts: 765
Joined: Tue Mar 12, 2013 10:58 am
Location: KCMO

Re: racking my brain

Post by redroadster » Wed Apr 18, 2018 6:41 pm

You Can't do that on cars anymore...that will be $ 80