Fit System 3990 Dual Lens Universal Towing Mirror

Introduction

Thank you for choosing the Fit System 3990 Dual Lens Universal Towing Mirror. This product is designed to enhance your field of view while towing, providing increased safety and visibility. The universal design allows for easy, tool-free installation on most vehicle mirrors. This manual provides detailed instructions for proper setup, operation, and maintenance to ensure optimal performance and longevity of your towing mirrors.

Safety Information

• Always ensure the towing mirrors are securely attached before driving.
• Periodically check the tightness of the ratchet straps during long trips.
• Do not obstruct your vehicle's primary mirror view with the towing mirror. The design of this product is intended to avoid this.
• Adjust mirrors only when the vehicle is stationary and safe to do so.
• Be aware that objects in the convex (smaller) mirror are closer than they appear.

Package Contents

Verify that all components are present before beginning installation:

• 2 x Fit System 3990 Dual Lens Universal Towing Mirrors
• 4 x Ratchet Mount Straps (2 per mirror)

Setup and Installation

The Fit System 3990 towing mirrors are designed for quick and easy installation without the need for tools. Follow these steps for secure attachment:

1. Prepare Your Vehicle Mirror: Ensure your vehicle's existing side mirror is clean and free of debris where the towing mirror will attach.
2. Position the Towing Mirror: Place the Fit System 3990 towing mirror over the top or bottom edge of your vehicle's existing side mirror. Ensure the rubber pads on the towing mirror's clamps make firm contact with your vehicle's mirror housing. The towing mirror should be positioned so it does not obstruct the view of your primary mirror.
3. Attach the Ratchet Straps:
   • Feed one end of a ratchet strap through the slot on the towing mirror's clamp.
   • Wrap the strap around the back of your vehicle's mirror housing.
   • Feed the strap through the corresponding slot on the opposite clamp of the towing mirror.
   • Repeat for the second strap, ensuring both straps are positioned to provide maximum stability.
4. Secure the Straps: Pull the loose end of each strap to remove slack. Then, use the ratchet mechanism to tighten the straps. Press the ratchet lever repeatedly until the towing mirror is firmly secured to your vehicle's mirror and does not wobble. The rubber pads on the straps protect your mirror from scratches.
5. Check Stability: Gently push and pull on the installed towing mirror to confirm it is stable and will not shift during driving. Adjust strap tension if necessary.

Image: The Fit System 3990 Dual Lens Universal Towing Mirror securely attached to a vehicle's side mirror using the ratchet mount system. This image illustrates the dual lens design and the strap placement for installation.

Operating Instructions

Once installed, the Fit System 3990 provides an extended field of view. It features a dual lens design:

• Main Flat Mirror: Provides a true-to-distance reflection, similar to your vehicle's primary mirror, but extended for towing.
• Convex Spotter Mirror: The smaller, adjustable convex mirror offers a wider angle view, ideal for eliminating blind spots and observing traffic in adjacent lanes. Adjust this mirror manually to suit your viewing preference.

Adjust the main mirror by gently moving the mirror housing to achieve the desired angle for optimal rear and side visibility of your trailer.

Maintenance

• Cleaning: Clean the mirror surfaces with a soft cloth and standard glass cleaner. Avoid abrasive cleaners that may scratch the mirror or plastic housing.
• Strap Inspection: Regularly inspect the ratchet straps and rubber pads for any signs of wear, cracks, or damage. Replace worn straps immediately to ensure secure attachment.
• Storage: When not in use, store the towing mirrors in a clean, dry place away from direct sunlight to prolong their lifespan. To remove, press the quick-release button on the ratchet for easy strap adjustment and fast removal.

Troubleshooting

Issue: Mirror vibrates excessively during driving.

Solution: Ensure the ratchet straps are tightened sufficiently. The ratchet lock system is designed to provide maximum clamping power to reduce vibrations. Reposition the mirror slightly to find a more stable attachment point on your vehicle's mirror housing. Check that the rubber pads are correctly seated and providing good grip.

Issue: Mirror does not fit securely on vehicle's existing mirror.

Solution: The dual ratcheting plastic mounting straps are designed to fit most mirrors up to 11.5 inches in height. Verify that your vehicle's mirror falls within this size range. Adjust the strap routing to ensure it wraps around the most stable part of your vehicle's mirror housing. Ensure the clamps are fully engaged.

Issue: Difficulty adjusting the convex spotter mirror.

Solution: The convex mirror is designed for manual adjustment. Apply gentle, even pressure to the edges of the small mirror to pivot it to the desired angle. Avoid excessive force.

Specifications

Warranty and Support

For warranty information or technical support regarding your Fit System 3990 Dual Lens Universal Towing Mirror, please refer to the manufacturer's official website or contact their customer service department. Keep your purchase receipt as proof of purchase.

Manufacturer: Fit System