[LET]

It works if i run clip wire from + post on battery and a clip wire from - terminal to motor. Plug it in to the car, nothing. Power is there when i turn on wiper switch, so its getting power. Won't run. Whats going on???

Thanks
LET

[242177P]

"Power is there". What about ground? It worked when it was hooked up to negative. When motors use mounting points for ground, paint can easily interfere

[Greg Reid]

If I recall correctly, the wiper is one of those things that are turned on when a ground is provided... similar to the interior lights where 12 volts is always present on the light but the ground is provided by the door switch.

[GoGoat]

The hot + wire is present at motor when key is on. Dash switch delivers the ground - to the motor. Motor case ground is there for it to continue to the park location after dash switch is turned off.. Hope this helps.

[Greg Reid]

LET, have you tried putting the negative jumper to body ground instead of battery negative? I'm talking about when you put the positive wire to the positive terminal of the battery.

[Hammertime Mike]

I ran into what was a grounding issue with the wipers in my 67. At the time it was a new car to me. I got mine to work as you did. Mine ended up being a missing ground, A flat metal that fit to the wiper motor and headlight switch. I only realized the missing part when looking at a dash cluster that I had. Once I added this the wipers worked properly. Hope this helps.

[Peter Serio]

Here is a photo of a 66 Lemans dash bezel, the ground strap for the headlamp switch + the wiper/washer switch is highlighted in blue.

The '67 GTO/Lemans ground strap has one tiny bend in it that is different from a 66 but the overall mounting and location of the strap is the same.