1. Identify the Problem:
* Wiper blades don't move at all: This points to an electrical or mechanical problem in the motor or linkage.
* Wiper blades move slowly or intermittently: This could be a weak motor, a bad connection, or a problem with the switch.
* Wiper blades chatter or skip: This usually means worn blades, a dirty windshield, or a problem with the wiper arm pivot points.
* Wiper blades only work on one speed (or only work intermittently on one speed): This strongly suggests a problem with the wiper motor or its switch.
* Wiper blades park in the wrong position: This indicates a problem with the parking mechanism within the motor or linkage.
2. Troubleshooting and Repair:
* Check the Wiper Blades: The easiest fix! Replace worn or damaged wiper blades. This is often the source of chattering or skipping. Ensure you get the correct length and type for your 1985 Dodge Ram.
* Inspect the Wiper Arms and Linkage: Look for any loose connections, broken parts, or excessive wear in the pivot points. Tighten any loose connections or bolts. If parts are broken, you'll need to replace them. These parts are often prone to rust on older trucks. Lubricate pivot points with a light grease if necessary (but avoid getting grease on the windshield).
* Check the Wiper Motor:
* Access: Locate the wiper motor (usually under the hood, near the firewall). Access may require removing some parts. Refer to a repair manual for your specific truck model.
* Visual Inspection: Look for any obvious damage to the motor housing, wires, or connections.
* Testing: With the ignition on, check for power at the motor's terminals using a multimeter. If no power, check the fuses and wiring leading to the motor. If power is present but the motor doesn't work, the motor is likely faulty and needs replacement.
* Check the Wiper Switch: This is located on the steering column. Test it for continuity using a multimeter. A faulty switch will need replacement.
* Check the Fuses: Check the fuse box for blown fuses related to the wipers.
* Check the Wiring: Examine the wiring harness leading to the motor and switch for any breaks, shorts, or corrosion.
3. Repair Manual:
For detailed instructions specific to your 1985 Dodge Ram's wiper system, you'll need a repair manual. These are available online (often in PDF format) or from auto parts stores. A repair manual will provide diagrams, specifications, and step-by-step instructions. Knowing the specific trim level of your truck (e.g., 150, 250, 350, etc.) will help in finding the correct manual.
4. Professional Help:
If you're not comfortable working on your vehicle's electrical system or mechanical components, take your truck to a qualified mechanic. They have the tools and expertise to diagnose and repair the problem efficiently.
Remember to disconnect the battery's negative terminal before working on any electrical components to prevent accidental shorts or shocks. Safety first!
