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I have my 66 in a bunch of piles. The wiper motor and the heater motor are in these piles. When I got the truck it was not running and I took it apart. Now I am putting it back together (slowly) and I want to test these motors (wiper & heater) before I re-install them. Now, full disclosure I am not even close to being an electrical person; however, I can follow instructions most of the time. I have the 12-volt battery, but that is as far as I can go without some direction for you experts. Any help will be greatly appreciated.
thanks
rsh1966
12 volts (+) in one wire and the other wire to ground (-). If you can hustle the wiring schematic it will tell you which colour of wire is the positive 12 volts. Keep in mid two things:
1) The wiper motor will rotate 360 degrees in one direction only and this is correct. When your wipers are sweeping back and forth on your windshield it is because of the linkage attaching the arms and to the motor.
2) On the heater if you apply 12v positive to the fan motor it will run at maximum speed which equates to the high setting on your switch. You may wish to clamp the motor down to avoid it suddenly jumping up. If you wish to vary the speed you need the resistor pack which is what slows down the motor.
Heater motor works, now I can't get the wiper motor to work
I have two wiper motors on my workbench. Both from a 1966 f100. Both have the three prong connector. The only way I get fire is the touch the middle prong with the battery neg. (battery is sitting on the workbench) and the hot wire to the prong to the right side of the three-pronged connector. I get a spark but the motor will not run. Took the motor apart and cleaned it still did not work.
I think I am doing something work when I connect it to the battery. Do I need to actually ground the motor frame to something and then attach the battery leads??
Any suggests will be appreciated.
rsh1966
A tip from someone who learned the expensive way - an in-line fuse in your jumper wire would be a good idea.
I try to use a battery charger for tests, rather than a battery which can release a lot more current than you need.
Eric
Eric has a very good point about a battery having a high current discharge. I will look at my parts truck this weekend and see if I can tell the wiring for you. It is very common for auto accessories to ground where they bolt to to save running a negative wire all the way back to the battery.
Thanks for the reply and going to the trouble to look at your parts truck. I was thinking that maybe I should ground the wiper motor/frame to my truck frame and then try attaching the neg and hot leads.
I will also look behind the glove box for the relay that I read about in one of the threads.
I think the motors have a high probably of being good, but I have to connect them correctly.
Thanks for your help.
rsh1966
I took a peak today and there is one wiring harness going between my wiper motor and the wiper switch. This is a three wire harness and has a black in the middle and based on your pic in post #4 the spade on the right is blue and the spade on the left is orange with a black stripe. This harness goes to the wiper switch which on my truck which is a one speed on or off. As seen in my picture the white wire from the switch goes to a metal ground screw on the dash. The red wire plugs into the back of the wiper switch and goes to the ignition switch undoubtedly the 12v positive key powered. The blue, black and orange/black wire plug into the switch. I did not have the time to take apart the wiper switch to test which connection does what for the blue, black and orange/black wires so hopefully someone else here can help with the switch. I would recommend finding your switch and wiring harness for between the switch and wiper motor and test it that way with the red wire on the switch going to your battery + and the white wire going to the battery - (photo is the back of the wiper switch and the red wire plugs in just below where the orange/black wire goes in)
Thanks for your investigation into the wiring. I will go out today and take a look at my old donor cab wiring from the wiper three prong connection back to the switch. I printed your pic to take with me.
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