Bought a used bike a few days ago knowing that it wouldnt go into 4wd. I thought it would be an easy fix by replacing the servo motor. Here goes...

I first checked all fuses...good.
I put 2 c batteries on the front servo. Servo motor works.
I checked 1 relay. Bad. Replaced relay. Still no 4wd.
I checked other 2 relays. Good.
No 4wd.

What next?

 

Maybe this is it. http://forums.atvconnection.com/yama...cheap-fix.html

 

How about the actual switch at the handlebar?

 

Checking the motor with 2 c batteries confirms the motor is good.

 

I took apart the buttons on the handle bar. All connections appeared in good condition, nothing frayed, pulled apart. The manual says refer to checking the switch, but then all it does is tell you where it is. There was no checking procedure indicated.

The green light by the key is always on. So that tells m something has to be incorrect. I will continue today.

 

Replaced the 5 relays in the back. The light on the dash is off. The atv is now in 4wd with differential locked. Will not unlock or go out of 4wd.

 

Check the servo, to make sure it is back in proper and disengaging