Windshield Wiper Help

[Joey84cj7]

84 CJ7 . Wipers would not work so I replaced the wiper motor, still nothing. Replaced the switch, still nothing. Double checked ground wires, still nothing. The complete wiring harness was replaced a year ago. Everything is brand new except the connector at the back of the switch that connects power to switch and plugs into the wiper motor. Connections seem to be good. Any Ideas?

 

[JR74CJ5]

Do you have power coming in to the switch? Assume you've checked that, and if not, checked the fuse.

If you have power coming to the switch, but not out, then i would assume it's within the switch. The connection "could" be the issue, so when testing for power in - I would check it at the connection first.

Also - Moved to the chassis and Body section instead of site related questions - you should get more responses here.

 

[Joey84cj7]

Rechecked the fuse and it was blown. Put a new one in and it blew as soon as a turn the wiper switch on.

 

[mriplaybass]

Determine which wire is your power in, then which one is power out to the wipers, and which one is ground unless switch gets it's ground thru the frame via switch body. Unplug the harness from the back of the switch. If ground is achieved via a terminal, hook a jumper from the terminal to a good ground. Turn switch to off position. Hook a continuity meter to the terminal that provides power to the wiper motor, and the other wire to ground (any grounded metal surface). Turn switch on. If you have continuity, the switch is bad.

 

[Hedgehog]

Unplug everything in the wiper circuit. Put in a new fuse, plug in the next wire, check the fuse, plug in the switch check the fuse, turn the switch on, check the fuse, plug in the motor check the fuse, mark remove the motor and ground it turn it on and check the fuse. Eventually you will find the bad section or bad motor. There are other ways to go about finding an electrical problem, this is only one.

 

[Torxhead]

There is no oem ground wire hooked up, unless a p.o. installed one, which is a good idea.

 

[JR74CJ5]

Rechecked the fuse and it was blown. Put a new one in and it blew as soon as a turn the wiper switch on.

You have a short - probably worn power wire, or the plug to the switch, or the switch is grounding across connections. Could also be the plug is oriented incorrectly to the new switch you put in.

I'm going to guess its the switch or the load power wire from the switch to the motor is grounded out / shorting out blowing the fuse.

Going to have to do some tracing...

 

[IOPort51]

try pulling the motor and see if it will run stand alone. The wipers on a CJ are not one of AMC's best efforts. If the linkage binds up or needs lubrication you could very easily pop a fuse. Don't forget you still have to ground the case to make the magic happen.

 

[Joey84cj7]

Still haven't been able to get this working. I disconnected the motor from the switch. Then turned the switch on. The fuse did not pop. Plug the motor back in. The wipers went back to the resting position with no problem. Turned the switch on. At low, I get nothing. Fuse is fine but the wipers do not move. Turn it to high and the fuse pops. The motor is new. It was also doing the same thing with the previous motor. Not sure the previous motor is even bad now. What is causing the fuse to pop?

 

[Torxhead]

Check switch operation with a wiring schematic and a test meter.

 

[Joey84cj7]

I checked a wiring schematic and everything is wired correctly. I do have a multimeter but not sure which wires should show power and which ones should not. Can you explain how to check that?

 

[Torxhead]

The wiper motor housing needs a better ground than grounding it to just the windshield frame, so a wire to the battery negative from the motor housing is the best way to go at least for test purposes. In the high position, there should be power to the blue wire going into the motor. The blue w/tracer should be for the low speed operation. Inside the switch, the pink w/tracer is tied into the switched hot line and the yellow is tied to the low speed going into the motor. The yellow wire coming out of the switch is for the washer motor and should be hot with the washer turned on. As a guess, I think the yellow and pink w/tracer wires are for the wiper return circuit. I hope that helps.

 

[Neuner]

What size fuse?

 

[Joey84cj7]

Ok. so i am back working on this issue again. It is blowing 15 amp fuses immediately. I put in a 20 and the motor will go a bit further, maybe a full second but will then blow. I ran a ground from the motor to the frame, and it still blows the fuse. I disconnected the motor from the window and the motor does not go to park with the new fuse in. Once i reconnect it to the frame it parks. This tells me the ground is good. It still does nothing on intermittent and low. It pops a 15 amp fuse immediately on high and 20 amp will last maybe a second. the motor and switch are new. The only part that is not new is the connection on the back of the switch. It has 2 wires that run to the fuse box for wiper switch and wiper fluid power. It has a ground wire and wires that lead to a connector that the motor plugs into. The fuse does not pop with the motor wires are not connected. Once reconnected, it pops on high. Running out of ideas.

 

[Peanut Butter]

From the motor to the switch are three wires unless you have intermittent wipers. The black, green, and red are these three wires. The yellow wire goes to the washer motor. The red wire with a white strip comes from the fuse box to the switch.

Disconnect the motor from the linkage. Doe it run correctly in all positions. Make sure your grounded good at the motor and at the switch. If it does, then it is your linkage.

Linkage: Take it all apart and lube all of the movable joints with some grease. Put it back together and try moving it by hand. There should be little resistance. If there is you have a bent rod or a bad joint. If it moves freely reconnect the motor and try again.

Motor doesn't work correctly when not connected to the linkage. Switch is bad or motor is bad. Return and replace, then repeat the above steps. Make sure everything works when it is not connected to the linkage, otherwise you may burn up a switch or motor.

If you have a volt ohm meter you can check the voltage from the switch to the motor. The voltage should increase slightly when going from low to high.

One of these test should solve your problem.

 

[mtnwhlr]

One of these test should solve your problem.

Unless you have a power wire that has rubbed thru and is shorting out. Have you check them where they get pinched between the W/S frame and tub or where they go thru the tub?

 

[Lumpy Grits]

What gauge is the power supply wire to the motor?
You want at least 16 ga and 14 would be better.
Are you sure you have the polarity of the motor correctly wired?
LG

 

[Joey84cj7]

Peanut Butter - I have been through those steps. The motor and wiper are brand new. In fact, the entire Jeep has a new Painless wiring harness. It has a 4 wire motor. The fuse does not pop if the motor is not connected. It does pop when the linkage is disconnected.

mtnwhlr - I have checked the wires running through the tub and everything looks good.

Lumpy Grits - Im not positive what size the wires are but I do know the ground wire from the switch is 18. I'm fairly sure the others are larger.

 

[oldjeeplady]

Just a thought...you probably checked this but...
last year when I installed the 4 wire motor that came with the CJ7 (in a box ) I discovered the wire colors did not match the wiring diagrams. So I made a set up with a fused hot wire and a battery to bench test the motor. I also ran a ground from the neg battery terminal to the motor case. I was able to identify which wires had which function regardless of color. Then I removed the switch and did the same thing. I was able to wire the motor on the bench with the switch and get it to work both speeds and park. I discovered not all wiring motor colors mean the same thing even if they are listed for my model. I had to label them by their function and ignore the color. I couldn't just plug it in. I made my own "connector" with individual spade terminals. It looked weird, but it worked.

I also ran into this with the tail lights - they both had the same wire colors in the pig tail from the light, but they were different.

Unless you are sure all your parts are original or NOS I would suspect the same strange thing I ran in to. Because I bench tested the motor before I installed it I discovered the wire colors didn't match. If I had installed it and plugged it in I would have blown the fuse for sure. Hope this helps.

 

[Joey84cj7]

Oldjeeplady - The wire colors do not match. Im not good enough to bench test and figure the functions out. Would you happen to remember which colors did what or have the ability to take a picture to see if the colors match what I have? Thanks for your help.