help! wiper wiring

[PowerdbyChevy79]

whats up guys im having an issue figuring out the wiper wiring..i followed the schematic to a t and I get nothing.. where does it get its power from?.. if I hook up my power probe I can run the motor directly .. im running a painless harness and I just bought a new motor..kinda stuck guys....

[LockDoc]

Originally Posted by PowerdbyChevy79

whats up guys im having an issue figuring out the wiper wiring..i followed the schematic to a t and I get nothing.. where does it get its power from?.. if I hook up my power probe I can run the motor directly .. im running a painless harness and I just bought a new motor..kinda stuck guys....

The wiper gets it's power via the yellow wire in the original wiper loom. It comes from the fuse box. The yellow wire connects to one side of the wiper fuse.

I don't know if you have the wiper switch out or not but the wiper switch has to be mounted in the dash so it is grounded before the wipers will work....

LockDoc

[davepl]

As LockDoc notes, ground is important. The reason is because the wiper motor is hot at all times (under ignition anyway) and the switch provides the ground path. There's a built-in ground path to make it through a sweep, and the switch handles the return or park, depending on the switch position.

That's why if you remove ground you'll see them "start...no. start....no" over and over.

[PowerdbyChevy79]

ok.. i inherited this issue.. po had installed a painless and new motor (no pump) fuse was popped so im assuming they had the same issue..now I looked and the truck isn't grounded properly so imma tackle that.. the switch is mounted and I can now get them to come on if I push and hold the switch in.. .. so is the ground the issue?

[LockDoc]

Originally Posted by PowerdbyChevy79

ok.. i inherited this issue.. po had installed a painless and new motor (no pump) fuse was popped so im assuming they had the same issue..now I looked and the truck isn't grounded properly so imma tackle that.. the switch is mounted and I can now get them to come on if I push and hold the switch in.. .. so is the ground the issue?

It probably is the issue but it may not be like you are thinking. It may be in the wiring to the motor as they are all ground wires except the yellow ones. You also have to make sure that the wiper motor is grounded since it is mounted with rubber isolators.... In the picture below the arrow is pointing to the built in ground strap on the wiper motor. Make sure it is there.

See if there is anything in this thread that will help you....

http://67-72chevytrucks.com/vboard/s...d.php?t=413551

The 2 speed wipers are down a little ways.

LockDoc

[PowerdbyChevy79]

ok.so inwired my wipers up..i have a good ground on the motor and on the truck itself....wipers come on but wont stay on now.. andits only when I put the arms on.. with out the arms they start and stop correctly.. but with them on they go back and forth once and if I push the switch in and hold it they stay on as lond as im pushing in the switch

[LockDoc]

Originally Posted by PowerdbyChevy79

ok.so inwired my wipers up..i have a good ground on the motor and on the truck itself....wipers come on but wont stay on now.. andits only when I put the arms on.. with out the arms they start and stop correctly.. but with them on they go back and forth once and if I push the switch in and hold it they stay on as lond as im pushing in the switch

I don't have a clue what the arms would have to do with it....

I think you have 2 wires switched around on the back of the wiper switch ( or where you have them connected to the wiper). Try swapping the ones that are marked LBL and DBL in this picture and see what happens.

LockDoc

[PowerdbyChevy79]

if I wire like that schematic says the motor only bumps over... then it eventually pops the fuse.(that's how I originally found the wiring )... the way I had it working was I ran a wire from the fuse directly to the middle prong ran my black to low and my DBL to the high left the LBL dangling.. everything worked fine if I turned it to the right one click and pushed it in it would run at low speed, turned it two times to the right and pushed it in it would run at high speed.. ..so I figured I got it.. put the arms on.. it does half a sweep.. and I had sprayed water on the windshield so it would sweep freely.. nothing half a sweep is all I get.. I, thinking its the switch..what else could it be

[LockDoc]

Originally Posted by PowerdbyChevy79

if I wire like that schematic says the motor only bumps over... then it eventually pops the fuse.(that's how I originally found the wiring )... the way I had it working was I ran a wire from the fuse directly to the middle prong ran my black to low and my DBL to the high left the LBL dangling.. everything worked fine if I turned it to the right one click and pushed it in it would run at low speed, turned it two times to the right and pushed it in it would run at high speed.. ..so I figured I got it.. put the arms on.. it does half a sweep.. and I had sprayed water on the windshield so it would sweep freely.. nothing half a sweep is all I get.. I, thinking its the switch..what else could it be

If you have the hot wire connected to the middle spade connector you have it wired wrong. Here is how it should be connected. The yellow wire is hot.

LockDoc

[PowerdbyChevy79]

I did what you said LockDoc and it still gives me about half a sweep..gotta hold it in to keep em moving....it has to be the switch..so tomorrow i will get a switch...thx everybody fr chiming in with the help its much appreciated...

[LockDoc]

Originally Posted by PowerdbyChevy79

I did what you said LockDoc and it still gives me about half a sweep..gotta hold it in to keep em moving....it has to be the switch..so tomorrow i will get a switch...thx everybody fr chiming in with the help its much appreciated...

OK, let us know what happens with a different switch....

LockDoc

[VetteVet]

Like has been said, the yellow wire is the power wire from the fuse box and it is hot as soon as the ignition key is turned on. The speeds and the washer are controlled through the wiper switch which has to be grounded to the dash for the motor to work.

That being said you can bypass the switch by running a jumper from the low or high speed wire on the motor to the chassis ground and turning on the key. If the motor is grounded properly as shown then the motor should run.

Here is a possibility for the fuse blowing.
I discovered that the circuit diagram for the wiper motor wiring is wrongly illustrated on the electrical diagram. Whoever drew it up made the mistake of showing the hot yellow wire connected to one of the ground wires from the switch and if wired this way it will blow the wiper fuse as soon as that speed is selected. The correct way to wire the motor is shown in the second diagram.


Wrong




Correct

[LockDoc]

Originally Posted by VetteVet

Like has been said, the yellow wire is the power wire from the fuse box and it is hot as soon as the ignition key is turned on. The speeds and the washer are controlled through the wiper switch which has to be grounded to the dash for the motor to work.

That being said you can bypass the switch by running a jumper from the low or high speed wire on the motor to the chassis ground and turning on the key. If the motor is grounded properly as shown then the motor should run.

Here is a possibility for the fuse blowing.
I discovered that the circuit diagram for the wiper motor wiring is wrongly illustrated on the electrical diagram. Whoever drew it up made the mistake of showing the hot yellow wire connected to one of the ground wires from the switch and if wired this way it will blow the wiper fuse as soon as that speed is selected. The correct way to wire the motor is shown in the second diagram.

I started to copy that from Justins diagram and noticed it was incorrect so I didn't complete it. He hasn't been on the board since 7-21-15. I wonder if one of us should PM him about it in case he logs on.... Thoughts?

LockDoc

[PowerdbyChevy79]

Originally Posted by LockDoc

I started to copy that from Justins diagram and noticed it was incorrect so I didn't complete it. He hasn't been on the board since 7-21-15. I wonder if one of us should PM him about it in case he logs on.... Thoughts?

LockDoc

I wired according to that color diagram..and i kept popping fuses...the last pic you sent is different from that diagram it works as long as i keep the switch pushed in...thats why i say its the switch

[VetteVet]

Originally Posted by PowerdbyChevy79

I wired according to that color diagram..and i kept popping fuses...the last pic you sent is different from that diagram it works as long as i keep the switch pushed in...thats why i say its the switch

When you Push the switch in it activates a small electromagnet that lifts a small arm which allows a gear on the motor to pull and push a small plunger. This plunger is what forces the washer fluid out through the small hoses to the windshield nozzles.

Pushing the wiper switch in also grounds the pump motor on the low speed cycle and causes it to operate. I will continue to cycle as long as you hold in the switch. This signifies that you don't have a ground to your motor speeds except by the washer button. This is why I said you could bypass the switch by grounding the black wires from the wiper switch for the individual speeds.
If the motor works then your switch is bad or it is not grounded to the dash except in the washer mode.

wiper switch

[VetteVet]

Originally Posted by LockDoc

I started to copy that from Justins diagram and noticed it was incorrect so I didn't complete it. He hasn't been on the board since 7-21-15. I wonder if one of us should PM him about it in case he logs on.... Thoughts?

LockDoc

Doc I doubt he 'd see the PM if he hasn't logged on but maybe someone on the board knows how to contact him. What's his username?

[LockDoc]

Originally Posted by VetteVet

Doc I doubt he 'd see the PM if he hasn't logged on but maybe someone on the board knows how to contact him. What's his username?

"boundstaffpress" Here is the thread with the diagrams:

http://67-72chevytrucks.com/vboard/s...d.php?t=185856

The small ones are posted in the first two threads and there is a link in each thread to the larger ones.....

LockDoc

[PowerdbyChevy79]

Originally Posted by VetteVet

When you Push the switch in it activates a small electromagnet that lifts a small arm which allows a gear on the motor to pull and push a small plunger. This plunger is what forces the washer fluid out through the small hoses to the windshield nozzles.

Pushing the wiper switch in also grounds the pump motor on the low speed cycle and causes it to operate. I will continue to cycle as long as you hold in the switch. This signifies that you don't have a ground to your motor speeds except by the washer button. This is why I said you could bypass the switch by grounding the black wires from the wiper switch for the individual speeds.
If the motor works then your switch is bad or it is not grounded to the dash except in the washer mode.

wiper switchAttachment 1489518

Attachment 1489519

well I bypassed the switch like you said and the motor works properly...im picking up a switch this afternoon...

[PowerdbyChevy79]

well guys success.. put in a new switch... and boom they work... thx guys for all yalls help... couldn't of done it with out yalls help....

[LockDoc]

Originally Posted by PowerdbyChevy79

well guys success.. put in a new switch... and boom they work... thx guys for all yalls help... couldn't of done it with out yalls help....

Glad you got it sorted out and thanks for posting the results back.

LockDoc

[poway]

I was dealing with something similar today. Looking at the wiring diagram that I downloaded it shows the incorrect wiring on the wiper motor. Thanks for clarifying the diagram VetteVet! I do have it hooked up correctly.

Special thanks to LockDoc and VetteVet for all electrical issues!

[88Stanger]

Thanks for posting this! !! I have the same issues, thing to fix then now.

[LockDoc]

-
Glad folks are still using the info. I had to replace the switch in the '67 Panel Truck yesterday because it started getting flakey on me. I had to push in on it to get the wipers to work....

LockDoc

[The Rocknrod]

So Black and blue is Ground and Power 12V is Yellow?

[LockDoc]

Originally Posted by The Rocknrod

So Black and blue is Ground and Power 12V is Yellow?

Black, Lt Blue, and Dk Blue are grounds but they are only grounded through the wiper switch when it is switched to the different speeds or the washer button is pushed.

The Yellow is 12v when the ignition switch is in the "ON" or "RUN" position.

LockDoc