Troubleshooting Faulty Brake Light on a Yamaha Grizzly 

Troubleshooting a taillight or brake light that's not working on a Yamaha Grizzly YFM700 couldn't be simpler. 

Watch our Yamaha Grizzly YFM700 brake light video above and follow the walkthrough below to see what to test in which order.

Tools and Parts Needed - Troubleshooting Yamaha Grizzly Brake Light


  • Ratchet
  • 10mm, 14mm sockets
  • Circuit test light
  • Flathead screwdriver

PRO TIP: The replacement parts you'll need will vary depending on what has failed. However, you should always keep spare fuses and taillight bulbs in your toolbox just in case. 

Yamaha Grizzly brake light

Troubleshooting Tip #1 - Test the Fuse

A blown fuse will prevent the brake light and taillight from working.

Step 1. Remove the cover on top of the front fenders just in front of the handlebars to access the fuse box.

Yamaha Grizzly YFM700 fuse box

Step 2. Remove the fuse box cover and look for the orange 5 amp signal fuse.

Step 3. Turn on the Grizzly's ignition, and use a circuit test light to test for power at both sides of the signal fuse.

Yamaha Grizzly ATV ignition

Step 4. If the fuse is blown, replace it with a new 5A fuse, then check to see if the taillight is working.

Troubleshooting Tip #2 - Test the Brake Light Switch

If the taillight works but the brake light doesn't, the stop switch assembly could have failed. The stop switch assembly is the switch that activates the brake light circuit.

Step 1. Locate the stop switch assembly, just below the master cylinder on the handlebars.

Yamaha YFM700 Grizzly stop switch assembly

Step 2. Turn on the Grizzly's ignition, and use a circuit test light to test the switch. 

Yamaha Grizzly YFM700 ignition switch

Step 3. If the switch is defective, replace it with a new stop switch assembly and check to see if the brake light is working.

#3 - Test the Taillight Bulb

If the fuse and stop switch assembly are both working correctly, the problem is with the taillight assembly or the taillight/brake bulb itself.

Step 1. Remove the seat.

Step 2. Remove the rear rack by taking off the four 14mm bolts from the top and bottom of the rack, and the two 10mm bolts from either side of the rack.

Yamaha YFM700 Grizzly brake light change

Step 3. Remove the cover from the rear fender by taking off the two plastic rivets at the front, releasing the clip at the bottom, and using a flathead screwdriver to push in and release the four clasps on either side of the cover.

Step 4. Turn on the Grizzly's ignition, and use a circuit test light to test the yellow wire to see if the taillight assembly is receiving power.

Yamaha Grizzly ATV brake light test

Step 5. Remove the taillight bulb holder from the back of the rear fender by turning it counterclockwise and pulling it free.

Step 6. Remove the old bulb, replace it with a new taillight bulb, and reinstall the taillight bulb holder back into the taillight assembly. Turn on the Grizzly's ignition, and check that the taillight and brake light are both working.

Yamaha Grizzly brake light troubleshooting

Step 7. Reinstall the rear fender cover, the rear rack and the seat and you're done.









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