My diff lock just blinks when i push the switch. it goes in to 4 wheel drive fine. I found the relays under the seat and checked it for power with a test light. when i checked one wire in the relay the diff lock engaged but wouldnt disengage. i checked it again with the test light and it disengaged. i feel the relay is the problem but was just wanting to check with someone else to see if they have addressed this problem. the prongs on the relay were dirty and i cleaned them but it didnt help. just tring to get a second opinion or thought
thanx lee

 

What Yamaha and year do you have?

 

03 kodiak 450 4x4

 

Never heard of the 4x4 light flashing but have seen the reverse light flash a couple of times on other quads. I would recommend asking some of the guys at Grizzly Riders - Yamaha Grizzly Forum
for some help as see where that gets you. Hope this helps!

 

with the bike off.... when you activate the diff lock, do you hear the relay click?

 

maybe the idle is to high for diff loc to ingadge. just a thought