The Stovebolt Site Forums The Shop Area The Electrical Bay Grouding for Wiper Switch?? (1958-59)

I thought I had an issue with my switch. When I first tried to use it with a new motor
the switch needed some deoxit spray and it worked. But felt a little strange in the off /low /high.
Not a well defined transition. So when I tried this year, the wiper does not work.
I figured the switch finally went and needed a new one. I found one NOS ,installed it. Wiper still does not
work. I`ve traced everything and I think I have a ground issue. My question is,
Does the switch have to be grounded to the back of the dash? There may be rust there. I feel the motor is
properly grounded. I just put a new one in. It worked fine till it sat for a few months.

Remember this is a ground thru the switch wiring.. The Positive is always on when key is on to the motor.
So yes if you have a bad ground thru the switch it may give you issues.

quoting Orge from this thread which has pictures.
https://67-72chevytrucks.com/vboard/showthread.php?t=733878

"most pre-1980 electric wipers wire the same, power to the motor and ground thru the switch
the reason for this is the park function of the wipers
if you switch the power the wipers will stop where ever they are when the power is turned off
by switching the ground the internal cam switch keeps the motor on to the park area

the stock 2 speed electric wiper motor that orrieg posted has the switch on the motor and uses the same cable operator as the vacuum wipers
if your switch is a non-oem wired switch it will wire the same way; power to the motor and switched ground"

58-59 Trucks used a different motor than the 55-57 with the cable actuated switch.
They use a remote switch like the newer vehicles. It still may need to be grounded.
Fred

Note: The one shown in the link is the early type with the cable. Not sure why it is in a 59 but it is not
the normal configuration for that year.

Thats what I was thinking. Pic of the switch. Exactly what was in there and the wipers did work
with the old switch. Only thing that I have not checked and is the old original wire harness
from switch to motor. Ground to back of dash,if it needs it.

Turned out to be the wiring harness. The 2 wire harness thats up
at the wiper motor makes a hard right turn down and away from the top of the firewall.
That spade connection inside the harness was not good from being bent.