Hi i have a jcb 3cx contractor Project 21 12/2003 model

https://postimg.org/gallery/1cemg7yga/

i would like to ask you why

when i switch to 4wd mode

i don't get the indicator on the Cluster warning light on

there are 12 cables with 12 small bulbs, there are 4 bulbs for the left 4 small indicators 4 bulbs for the central warning and 4 bulbs for the right 4 small indicators

any advice will be much appreciated

regards