4x4 system has gone down

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fourtrak 1993 automatic locking hubs pressed the button today everything lit up but no four wheel drive i have read the other write ups about this problem but unsure where the two vacum pipes are located or the solenide any chance of pictures or full decription please this is my first one with 59000 miles on the clock thanks

vacum

the vacum pipes are on the side of the transfer box drivers side

thanks pal will check

thanks pal will check tomorrow will let you know how it goes thanks

lets get muddy