hi, all. ive got an early version a40 volvo articulating truck... it doesnt seem to be engaging all axles when locked in. at times it seems a though the rear tires are spinning but when we need the traction all i am finding is the one front tire spins. nothing in the back. cant find anything in the manual to help. looking for ideas before i tear into it,as its over an our out of town to work on it. ill probably look at for a fuse , or air air switch problem. the manual doesnt show a fuse or relay for the locking switch, but the light dont turn on in the dash when locked
Serial number?
a40v60169
Maybe this will help you. I am still searching for electrical.
Some more info
and some more.
Electrical
What about using the 6x6 button on the floor, does that allow front axle to engage?