1. Prepare:
* Disconnect the battery's negative terminal. This is crucial for safety to prevent accidental shorts.
* Gather tools: You'll likely need a small flat-head screwdriver, possibly a small Phillips head screwdriver (depending on the type of retaining mechanism), and maybe a small pry tool (like a plastic trim tool).
2. Access the Knob:
* Tilt the steering wheel: Tilt the steering wheel to its highest or lowest position to give you better access to the back of the wiper control stalk.
3. Locate the Retaining Mechanism:
* Look carefully around the base of the knob: There might be a small hole or a slot indicating a retaining clip or a small screw. A flashlight will help.
* Common Scenarios:
* Small Screw: A tiny screw might be hidden directly under the knob. Try inserting the flat-head screwdriver into any visible slots. Gentle pressure and turning might reveal a screw.
* Retaining Clip: A small retaining clip, usually plastic, might be holding the knob in place. You might need to gently pry the clip up or away from the stalk using your flat-head screwdriver or a plastic pry tool. Be extremely careful not to damage the plastic.
* Combination: There might be a combination of a clip and a screw.
4. Remove the Knob:
* Once the retaining mechanism is undone (screw removed or clip released), gently pull the knob straight off the stalk. Don't twist or pull aggressively, as you could damage the stalk or the knob.
5. (Optional) Remove the Stalk (if needed for deeper repair):
If you need to replace the whole wiper switch mechanism, there's usually another retaining mechanism (screw or clip) holding the stalk to the steering column. Refer to a repair manual or online resources specific to your 1989 Dodge Ram D150 for details on removing the entire switch assembly.
Important Notes:
* Repair Manual: The best approach is to consult a repair manual specific to your 1989 Dodge Ram D150. These manuals usually have diagrams and step-by-step instructions for removing components like the wiper control switch.
* Take Pictures: Before you start, take pictures of the knob's position and the area around it. This will help you remember how everything goes back together.
* Gently: Work gently throughout the process to avoid breaking plastic parts.
* Patience: It can be a bit fiddly. Take your time and be methodical.
If you're uncomfortable working on your vehicle yourself, it's always best to take it to a qualified mechanic.
