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Need to know what connections on wiper motor is hot and ground

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Shop4class, You didn't mention what kind of vehicle you are working on but the easiest way to check this is to look at wire colors. Ground wires are usually black. Power wires will usually vary in color but the easiet way to be sure is to get a test light and connect one end to the negative side of the battery. Turn the wiper to the on position and start to probe the plug. The test light will glow when you have found the power side of the motor. To test the gorund side of a circuit, you have to reconnect your test light to the positive side of the battery and then probe the black wire. The test light will glow when you found the right wire. Be careful when doing this as you may touch another power wire and start to blow fuses. To avoid this when testing the ground side of a circuit the best thing to do is to turn the wipers to the off position. Good luck with this.

Posted on Apr 11, 2011

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My windshield wipers don't work, on my 83' caddy

This is for a Deville. The two white wires at the top of wiper motor should be hot with key on, are they hot? Use a testlite to test. If they are not hot, have to check wiper fuse in fuse box. Not only check the fuse, check the fuse circuit for voltage, use a test lite. I believe the fuse circuit goes hot with the key on. The bottom wires from wiper motor, I believe to be grounds. So, it might be possible to use redundant ground for testing to see if any action from wiper/washer motor. I just don't know which color wire grounds what? My info on your model year isn't the best. At the moment, I can't rule out problem with motor, itself. Could be other issues?

Jun 22, 2017 | Cars & Trucks

1 Answer

2003 Pontiac Montana wipers not working how to fix

First you need a wiring diagram, free at Then you need a DVOM - digital volt ohm meter to test the circuit . Then if your not familiar with automotive electrical systems testing ,go on youtube an check out Electric Testing Techniques You Need to Know Also having a factory diagnostic trouble shooting chart would also be usefull . You could just start replacing parts , you mite get lucky . The wiper motor is a high fail part , so is the switch ..You could find the fuse is blown ! But fuse's don't usually blow without a reason . Short to ground , low resistance . ( high current flow) Also knowing how they work and what all is involved in making them work.
The Wiper/Washer System consists of the following components:
• Windshield wiper/washer switch
• Windshield wiper motor module
• Windshield wiper motor
• Windshield washer pump motor
• FRT/WPR/WSHR 25A fuse

Wiper/Washer System Operation
The windshield wiper motor module is part of the windshield wiper motor cover and controls wiper motor operation. The windshield wiper motor is a 2 speed motor and is operated at low speed in all modes except HIGH. The accessory voltage supply circuit to the windshield wiper motor assembly is used to operate the wiper motor in all of the low speed modes. The accessory voltage supply circuit to the windshield wiper/washer switch is used to supply the windshield wiper switch signal circuits and the wiper motor high speed circuit.
When the wiper/washer switch is in the LOW position voltage is supplied through a 24K ohm resistor within the switch to the windshield wiper switch signal 2 circuit, and accessory voltage is supplied to the windshield wiper switch signal 1 circuit. The reduced voltage from the wiper switch signal 2 circuit and accessory voltage from the wiper switch signal 1 circuit causes the wiper motor module to close the wiper motor accessory voltage supply circuit to the wiper motor low speed terminal.
Windshield wiper/washer system MIST operation is identical to LOW operation except that the MIST switch is a press and release type. When the wiper switch is moved to the MIST position and released, low speed wiper motor operation is started and will continue until 1 cycle is complete. If the wiper switch is moved to the MIST position and held, the windshield wiper motor will operate in the LOW mode until the switch is released.

Don't the wipers work in any mode ?
Did you review the Wiper/Washer System description and operation and perform the necessary inspections?
YES - Go to Step 2
NO - Go to Symptoms - Wiper/Washer Systems
Turn ON the ignition , with the engine OFF.
Operate the windshield wiper/washer switch through all the switch positions.
Does the windshield wiper/washer system operate normally?
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 3
Turn OFF the ignition.
Disconnect the harness connector of the windshield wiper motor.
Turn the ignition ON, with the engine OFF.
Connect a test lamp from the accessory voltage circuit of the windshield wiper motor to a good ground.
Does the test lamp illuminate?
YES - Go to Step 4
NO - Go to Step 13
Connect a test lamp from the accessory voltage circuit to the ground circuit of the windshield wiper motor.
Does the test lamp illuminate?
YES - Go to Step 5
NO - Go to Step 14
Connect a test lamp from the signal 2 circuit of the windshield wiper switch to a good ground.
Press the windshield washer switch.
Does the test lamp illuminate?
YES - Go to Step 11
NO - Go to Step 6
Let me know if you make it this far and i will send rest of diagnostic's

Nov 25, 2016 | 2003 Pontiac Montana

1 Answer

Wipers wont come on. replaced relay inide, fuses,

The switch that runs the wipers, applies a ground to the wiper motor.
If you have 12V on the hot side of the motor, there must be something wrong with that ground connection.
There are two ground connections at the motor, one for slow speed and one for high speed. So try high speed just to test if that ground will work.
Intermittent applies a ground to the slow speed automatically. So try int also.
At the connector on the motor, you could apply your own ground wire.
Hope this helps.

Apr 01, 2015 | Cars & Trucks

2 Answers

Got power to motor,but wiperblades wont move.

check and make sure it has ground if it dose your motor is shot but alot of times those motors are mounted on rubber so they have a hard time getting a good solid ground

Dec 18, 2010 | Honda Accord Cars & Trucks

3 Answers

Front wipers will not operate. checked fuse and relay look ok. back wiper works

Here are a few other things to check beside the fuse and relay:

Check Wiper Motor - the wiper motor is the driving force of the windshield wiper. Feel the motor and listen to a humming sound. If there is no humming, the motor is the problem. Check if the motor is working properly and see to it that its electrical connections are made properly. If you find that the motor is dead and beyond repair, get it replaced immediately.

Check For Break in Connecting Wires - the connecting wires of the motor sometimes go loose and that may cause the windshield wipers to stop working. Also check the battery plug connection which the motor has. Connecting the loose wires properly or fixing/replacing the plug might solve your problem.

Check Wiper Switch - another wiper assembly part that can malfunction is the wiper switch itself. Check for switch malfunction and if you find that is indeed the problem, get it replaced from a mechanic.

Check for Bent Wiper Arms - bent wiper arms can cause the operation of the wipers to be hampered. If the wiper arms are bent beyond repair, get them replaced immediately.

Nov 25, 2010 | 2003 Isuzu Ascender

2 Answers

Vw golf mk3 wipers not working,fuse ok. sometimes work if blades assisted manually


Nov 18, 2010 | 2000 Volkswagen Golf

3 Answers

Windshield wipers stopped working not fuse is there a relay and where is it

with the key on and the wiper switch in the low or high position tap the wiper motor with a screwdriver handle. If it starts working replace the wiper motor.

Sep 26, 2010 | 2002 Buick Rendezvous

2 Answers

Wiper doesn't work

If you can pull and wiggle one wiper blade and the other one moves then the linkage is hooked up then thats good wiggle it with the key on and the switch on and see if it'll start moving if it does it may work awile but the motor ( wiper) is bad. nothing happens the fuse could be blown as someone tried to make it work when stuck in ice. or the switch got brocken or wet and now its bad. Test light at the plug where it connects to the motor is next as all the wires come hot in the different positions of the switch even in off theres a wire hot. With it plugged in and there is more than one wire hot at a time then the ground is bad and the bolts that hold it on are dirty or loose or both. Power and grond are both good the motor is bad. Toyotas are good and the peaple the work on them are not so look for things that are out of place or disconnected and make sure that every thing is plugged in and re plugged in before you try anything else including the connections at the battery as one of them only runns the wiper

Oct 12, 2009 | 2002 Toyota Corolla

3 Answers

Wipers do not work. i replaced the wiper switch and checked the fuses ,The red wire to the wiper moter has power ,how do I know if the wiper moter is defective?

there are usually two hot wires going to the wiper motor .. also a ground strap that may be bad ... one of the hot wires is always on if the key is on ... that for homing the wiper blades when you turn them off .. the other power input is from the wiper control circuit .. its only on if the wiper switch is turned on .. if you have power on the homing input then that wont do anything unless the wipers are not in home position .. if you have power to the "run" wire of the motor and the ground is good then the motor should run unless its defective .. you can put a jumper cable from the ground of the wiper motor to the engine block or battery neg, to check if the ground wire is causing the trouble .. that happens frequently in some models but not sure about your E250 ...

Oct 04, 2009 | 2002 Ford E250

1 Answer

Wiper blades not working on 1999 Neon, and it is not the fuse

If you hear the wiper motor running, the linkage has come loose. Remove cowling under windshield to repair.

If no motor running, it's either the relay or the motor itself which is malfunctioning.

Find relay, check for 12 volts from hot wire to ground on wiper motor wires connected to relay.

If no voltage, relay is faulty.

If voltage on relay, wiper motor is faulty.

More info, let me know.


Aug 31, 2009 | Dodge Neon Cars & Trucks

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