1. Check the Fuses:
* Locate the fuse box: This is usually under the hood or in the passenger compartment (consult your owner's manual for the exact location).
* Identify the wiper motor fuse: Your owner's manual will show you which fuse is for the wipers. It might be labeled "Wipers," "Windshield Wiper," or have a similar designation. The amperage rating will also be listed.
* Inspect the fuse: Look for a blown fuse (broken filament inside). Replace it with a fuse of the *same amperage* if it's blown. Don't use a higher amperage fuse, as this could damage other components. If the new fuse blows immediately after replacement, you have a short circuit somewhere in the system.
2. Check the Wiper Switch:
* Test the switch: Turn the ignition on. Try all wiper positions (intermittent, low, high, wash). If the wipers don't work in any position, the switch is suspect. This is usually the next most common failure point after fuses. Replacing the switch is often more involved than replacing a fuse.
* Visual Inspection (optional, but helpful): Inspect the switch for any obvious damage or loose connections. This is more difficult and requires some disassembly.
3. Check the Wiper Motor (Directly, if possible):
* Accessibility: This is the hardest part. Access to the wiper motor on a Comanche can be challenging. It's usually located under the hood, near the firewall, and often obstructed by other components. You may need to remove some parts (air intake, etc.) to get to it.
* Jump the Motor (Advanced, requires caution): If you can access the motor's wiring harness connectors, you can carefully try jumping the power wires directly to test the motor. Use a 12V battery and appropriate sized jumper cables. Be extremely careful not to short the positive and negative terminals together. This will only tell you if the motor is functioning. Incorrectly connecting wires can damage your vehicle's electronics. Only attempt this if you are comfortable working with car electrical systems.
* Listen for the motor: If you can access it, try turning the switch and listen for any clicking or humming from the motor. A lack of sound usually indicates a motor problem.
4. Check the Wiring Harness:
* Visual Inspection: Examine the wiring harness from the switch to the motor for any broken, frayed, or corroded wires. Pay close attention to the connections at the motor and the switch.
* Continuity Test (Advanced, requires multimeter): If you have a multimeter, you can test the continuity of the wiring to ensure there are no breaks in the circuit. This requires a good understanding of electrical testing procedures.
5. Check the Wiper Linkage:
* Mechanical Issues: The wiper linkage could be frozen, broken, or disconnected. Check for any obvious damage or binding in the linkage mechanism.
Important Considerations:
* Owner's Manual: Consult your Jeep Comanche's owner's manual. It should contain a wiring diagram and fuse box layout.
* Safety: Disconnect the battery's negative terminal before working on the electrical system to prevent shorts or injury.
* Professional Help: If you're not comfortable performing these checks yourself, take your Jeep to a qualified mechanic. Diagnosing electrical problems can be tricky.
This systematic approach should help you pinpoint the problem with your Jeep Comanche's windshield wipers. Remember safety first, and don't hesitate to seek professional assistance if needed.
