Re: Testing Windshield Wiper Motors
 

The truck is a 1970. I will try to post a picture but have not done it before. Hope it works.

Re: Testing Windshield Wiper Motors
 

This ground attachment is kind of built into the wiper mounting pads so you may be overlooking it. Remember that the wiper switch has to be grounded good too or the wipers won't work right.

LockDoc

Re: Testing Windshield Wiper Motors
 

It came through fine.... Plug the double black connector onto the two center terminals and the single black connector to the terminal on the left in the picture. The extra terminal on the right side is for the earlier trucks. (before '67)

LockDoc

Re: Testing Windshield Wiper Motors
 

I just got done using these instructions to bench test a wiper motor and it was a breeze! I took some pictures of a little wire harness I made up for it:

Red wire to the hot terminal, black to motor housing, with a leg off with a spade connector.

http://i3.photobucket.com/albums/y55...hwiring001.jpg

With the red and black to a 12v source and the white jumper on both terminals, this is run slow:

http://i3.photobucket.com/albums/y55...hwiring002.jpg

Just like above, but with the jumper off, is run high:

http://i3.photobucket.com/albums/y55...hwiring003.jpg

Jumper connected again, but black (ground) off, return to park:

http://i3.photobucket.com/albums/y55...hwiring004.jpg

Thanks to LockDoc for this thread!

Re: Testing Windshield Wiper Motors
 

-
Thanks. Glad you found it useful. I keep a small motorcycle battery around to test them with. It doesn't take much.

LockDoc

Re: Testing Windshield Wiper Motors
 

Where does the windshield washer pump play into this? in the pictures above, the 2 terminals, what should go there? I'm running an aftermarket wiring harness, so doing a lot of this from scratch.

Also, while the wiper motor terminals are clear, but what goes to what, from the switch?

my switch has the 3 terminals, 1 high, 2 low, same with the wiper motor.
_ 1 goes to ?

_ 2 goes to ?
_ 3 goes to ?


and on the wiper motor,

_ 1, 2, or 3?

_ 1, 2 or 3?
_ Power

_? _ ? on the backside of the pump

I'm also assuming that the washer function gets jumpered in here somewhere?

Re: Testing Windshield Wiper Motors
 

This thread might help with the wiring.

http://67-72chevytrucks.com/vboard/s...d.php?t=584603

LockDoc

Re: Testing Windshield Wiper Motors
 

I recently bought a new two speed wiper for my 67 gmc and it worked fine when I tested it before install. Ever since I put it in it will not work. I do not have the washer motor on the wiper motor because I didn't think it mattered and I checked the voltage and there is 12 volts everywhere in the circuit all the way to the wires that plug into the switch. The only thing I haven't done is tested the switch with an ohm meter because I do not know how. Could you please explain exactly what you mean by that i do have a dmm so I can if i know how. And any other suggestions to try are welcome :D

Re: Testing Windshield Wiper Motors
 

The washer would not make a difference as long as all of the original wiring was there... Is the switch installed in the dash and the nut tightened up? It has to be to work because that is where the circuit gets it's ground. As far as testing the switch, unplug the connector from the switch and set the meter to the lowest ohm setting, which should be 20k ohm. Turn the wiper switch to the low position and touch one of the leads to the switch body and the other lead to one or the other of the connectors. You should get a reading when you touch the low speed connector (I can't remember which is which). Then turn the switch to the high setting and touch the other connector you should get a reading. In the off position you should not get a reading.

LockDoc

Re: Testing Windshield Wiper Motors
 

This has been an excellent read. I have gutted the dash on my '70 and cleaned it up, replacing some of the switches. Presently I have a two speed wiper setup with a push in wash.

I would like to replace the switch such that I have an intermittent feature but I do not know if I can just replace/install the switch or if I would have to upgrade the motor also.

I have been looking at different switches and have run across a term I am not familiar with: coast to park and dynamic park.

I have the rectangular motor like the one pritch has pictured. I believe it is dynamic park (?)

Re: Testing Windshield Wiper Motors
 

Glad you enjoyed the thread. One of our members on the board sells the delay kit on the parts for sale forum. Here is a link to his for sale thread.

http://67-72chevytrucks.com/vboard/s...d.php?t=593984

I am not familiar with those terms either so I can't help you with that.

LockDoc

Re: Testing Windshield Wiper Motors
 

Wiper motors are voodoo! Until I read this thread. Now they are just a pain in the brain!
I have a 69 C10 with a 3 terminal (2 speed?) wiper motor. 12V at the motor. Jumped the wires as instructed above and get just one speed . Removed cowl and freed the wiper transmission arms so motor could run free. Still just one speed.
Suggestions?
Thanks guys!

Re: Testing Windshield Wiper Motors
 

Thanks for the link, LockDoc. It looks like the thing I have been wanting but recently my time has been consumed with so many other things it may be a little while before I fit one iota (is that a word?) of more part replacement. Right now its a mad race with the warm weather and short days to get everything done that need done immediately.

Turns out that my wiper motor works just fine. However, while it was apart I couldn't resist screwing with the washer motor (had to figure out how that ratcheting pawl worked) and I think I may has put it back together in a position different than it should be. I bought a little rebuild kit and rebuilt it (the washer mechanism) and while in there I just had to know what made that ratchet mechanism stop and go. So, I discovered the if I push the piston down against its spring, the rachet mechanism will move to various positions. Neat!

But now that my friend has re-installed the wiper motor, the washer doesnt seem to draw fluid.

Does anyone know if there is a particular position that mechanism must be in to start properly? Maybe I should put a multimeter on the switch and check for juice.

Re: Testing Windshield Wiper Motors
 

I don't have the same type of prongs as the ones pictured above. I have three total to hook up to. I don't understand the part about hooking up to the "bottom terminal on the round motor."? I did get mine to run, it chugs along in one speed. How can I check from here to see if two speeds work?

Re: Testing Windshield Wiper Motors
 

here's a closer picture of the prongs on my wiper motor. Just three of them.

Re: Testing Windshield Wiper Motors
 

Pritch has an adapter terminal (one to two) in the pictures above. If you look close it actually only has three terminals like yours.

You do not have a round motor so you don't need to pay any attention to the "bottom terminal on the round motor." part. All '67-'72 trucks use the rectangular wiper motor. If you follow the testing procedures above for the "two speed" wipers (1st post and Pritches post) it will test both speeds.....

LockDoc

Re: Testing Windshield Wiper Motors
 

That adapter terminal threw me off and I thought I had a round motor...I'll give that a shot. Thanks "LD"

Re: Testing Windshield Wiper Motors
 

Be sure and clean the spade terminals good, they look pretty corroded. If your wife has one of those flexible finger nail files use the fine side of that. (don't tell her I told you to though)....:)

LockDoc

Re: Testing Windshield Wiper Motors
 

Great thread.
I have one pump on my bench that I cleaned out, and it may be going into my truck, if I can't get my current one to pump. I'm hoping I can take the pump apart and clean the intake, while it's still in the truck. It'll depend on how the pump sits on the firewall. I keep y'all posted

Re: Testing Windshield Wiper Motors
 

Great thread.
I have a complete pump on my bench that I took apart and cleaned, to get back into working order. It's really pretty easy, when it's out of the truck. I'm hoping I can get the one in my truck working again , by taking the intake apart and cleaning the little holes out, while its under the dash. The pump is operational, but it won't pump any fluid right now, and the wiper portion works fine. If I can't get things working, I'm going to have to go with the remote setup that I've seen other members use.

Re: Testing Windshield Wiper Motors
 

Checked and found ok! At first it wasn't parking because my jumper wire was spliced bad, I squeezed it and duh!..And got the nail abrasive board from spousal unit. All cleaned up and purty. Thank you!

Re: Testing Windshield Wiper Motors
 

Good deal! Now you'll be "Singin' In The Rain"...:)

LockDoc

Re: Testing Windshield Wiper Motors
 

They can be a bear to get fixed. You wouldn't think they would be so temperamental. Let us know how it goes....

LockDoc

Re: Testing Windshield Wiper Motors
 

You're "Dating Yourself" big guy! I wish you lived down the street so I pick your brain and harass you non-stop. Thanks again!

Re: Testing Windshield Wiper Motors
 

Only problem is I'm really that old.

I'm only as far away as your keyboard so you can pick and harass at your leisure..:)

LockDoc