Wiper short circuit - JeepForum.com
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post #1 of 22 Old 01-27-2021, 04:41 AM Thread Starter
NL | CJ-7
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Wiper short circuit

Hi all,

I’ve got a problem with the windshield wipers.

Every time when i turn them on, the fuse blows out.

It is a brand new Painless wiring harness, brand new switch and the “old” motor.

I’ve tried with the old switch, same problem.

Checked the wiring to the motor, it seems okay.

Any tips were to look?

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post #2 of 22 Old 01-27-2021, 05:04 AM
John Strenk
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Well the motor does need to be grounded to work but I don't think that will cause a short and pop fuses.

Do you have a delay wiper module or just a straight 2 speed control.
This is a Delay System:
Name:  Wiper Delay and switch.jpg
Views: 57
Size:  10.6 KB

And I assume it worked before you installed the painless harness, and you have the right size fuse.

Here are some schematics.

This shows the current flow with a non-delay wiper system.
When the wipers are not in the parking position, then power is supplied to the low speed contact to move the wipers.
wipernotinpark.jpg

Once the wipers motor reaches the park position. a switch closes and shorts to ground to create a braking effect on the motor so the wipers won't slip by the park position.

4wirewiper004.jpg

A little animation:
wiperanimation2.jpg

Some motors have been wired wrong and will blow fuses but I assume the motor and switch worked before?

How much of the connecting harness is made by painless and how much is original?

I would have to look but maybe if you have a harness for a delay system and put it in a non-delay system, something might not be right. I would have to check.

This is the schematic for a delay system.
84-86schk.jpg

Do you have a wire list from painless or a drawing how they say you should hook it up?


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post #3 of 22 Old 09-18-2021, 01:30 PM
BradWilson101
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Mind if I jump in? I’m having the same issue. Thanks to John’s diagrams I’ve tested the switch it appears to me working correctly. That being said… is there a way to test the motor? I assume by grounding the motor and applying 12vdc to the red or green wires the motor should move? The output shaft on the motor won’t spin in the off position but again, I’m assuming that’s because of the “park position”. Thanks for letting me hack in. TIA

75 CJ-5 with 76 glass tub. 350 sbc with Edelbrock 600cfm, SM465, D20, D44 w/ 3:73, D30 w/ 3:73, Novak Hydro Clutch Convo. Turned into a frame off resto so it's still in progress.
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post #4 of 22 Old 09-18-2021, 01:42 PM
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As a follow up. The Centech wiring diagram shows a 10a fuse. I tested the motor with direct power and no movement just little blue flashes and snapping noises.

75 CJ-5 with 76 glass tub. 350 sbc with Edelbrock 600cfm, SM465, D20, D44 w/ 3:73, D30 w/ 3:73, Novak Hydro Clutch Convo. Turned into a frame off resto so it's still in progress.
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post #5 of 22 Old 09-18-2021, 04:25 PM
John Strenk
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Quote:
Originally Posted by BradWilson101 View Post
As a follow up. The Centech wiring diagram shows a 10a fuse. I tested the motor with direct power and no movement just little blue flashes and snapping noises.
What connections are you testing it.

It could be the motor is frozen or you touching the park pin or what ever you’re powering it with cannot supply enough power.


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post #6 of 22 Old 09-18-2021, 04:32 PM
BradWilson101
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I tested both the red and green wires. I even popped in a 30a fuse and it still didn’t spin. I removed the power before I let the smoke out of the wires.

Are those motors serviceable?

75 CJ-5 with 76 glass tub. 350 sbc with Edelbrock 600cfm, SM465, D20, D44 w/ 3:73, D30 w/ 3:73, Novak Hydro Clutch Convo. Turned into a frame off resto so it's still in progress.
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post #7 of 22 Old 09-18-2021, 04:35 PM
John Strenk
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I never tried but they are easy to take apart.


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post #8 of 22 Old 09-18-2021, 05:04 PM
BradWilson101
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Well…. I opened up the motor and it was stuck. Got it all freed up and put it back together. Tested again and popped the fuse. Opened in back up to find….. I broke one of the bushes. Ugh

75 CJ-5 with 76 glass tub. 350 sbc with Edelbrock 600cfm, SM465, D20, D44 w/ 3:73, D30 w/ 3:73, Novak Hydro Clutch Convo. Turned into a frame off resto so it's still in progress.
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post #9 of 22 Old 09-18-2021, 07:29 PM
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Garage
Our "Tru-Value" Hardware store has like a million plastic drawer-like boxes on one of the aisles.

radio knobs, allen screws, corks------Special??? You name it, it's in one of them drawer/ boxes.

They have a decent selection of "Brushes" small to larger, for popular motors.

I was working on an old Modeler's air brush compressor, basically a blower thru a hose to the nozzle, smaller than a soda can.

The brushes were worn to nothing and it needed new ones, Tru-Value had some too little and slightly too big.

I was able to grind them to size, doing "figure 8s" on some sandpaper.

If that helps----it was a great story anyway!

-----JEEPFELLER
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post #10 of 22 Old 09-29-2021, 03:51 PM
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As it turns out… I took it to the local Mennonite run electrical shop. For less than $25 they fixed it up and it’s working. Next question. How do I know what position to put the arm back on?

75 CJ-5 with 76 glass tub. 350 sbc with Edelbrock 600cfm, SM465, D20, D44 w/ 3:73, D30 w/ 3:73, Novak Hydro Clutch Convo. Turned into a frame off resto so it's still in progress.
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post #11 of 22 Old 09-30-2021, 07:55 AM
John Strenk
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Quote:
Originally Posted by BradWilson101 View Post
As it turns out… I took it to the local Mennonite run electrical shop. For less than $25 they fixed it up and it’s working. Next question. How do I know what position to put the arm back on?
Hook up the motor
turn the wiper on.
Shut off the motor.
Wait until the armature stops turning.
This is the "Park" position for the wipers.

Put the arm on so it's horizontal and points to the passenger side of the jeep.


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post #12 of 22 Old 09-30-2021, 10:25 AM
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Generalized position of the arms in park
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post #13 of 22 Old 09-30-2021, 10:27 AM
BradWilson101
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Thanks John. I found that in another post. Unfortunately it wouldn’t “park” and then just started blowing fuses. Time for a new one

75 CJ-5 with 76 glass tub. 350 sbc with Edelbrock 600cfm, SM465, D20, D44 w/ 3:73, D30 w/ 3:73, Novak Hydro Clutch Convo. Turned into a frame off resto so it's still in progress.
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post #14 of 22 Old 09-30-2021, 01:12 PM
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Quote:
Originally Posted by BradWilson101 View Post
Thanks John. I found that in another post. Unfortunately it wouldn’t “park” and then just started blowing fuses. Time for a new one
Parking only works if its connected to the switch. Otherwise it will just drift past the park position. If you hook it up to just one wire, Then it could run for a cycle and then blow a fuse at the park position.


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post #15 of 22 Old 09-30-2021, 06:18 PM
BradWilson101
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Quote:
Originally Posted by John Strenk View Post
Parking only works if its connected to the switch. Otherwise it will just drift past the park position. If you hook it up to just one wire, Then it could run for a cycle and then blow a fuse at the park position.
Unfortunately it was hooked to the switch. It just kept spinning. It was the last attempt to try and park it when the fuses started to blow. But that's the least of my worries now. Got it fired up and the antifreeze started pooling on the passenger's side floor.

75 CJ-5 with 76 glass tub. 350 sbc with Edelbrock 600cfm, SM465, D20, D44 w/ 3:73, D30 w/ 3:73, Novak Hydro Clutch Convo. Turned into a frame off resto so it's still in progress.
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