jacobs electric retarder------ help

[Peggy & Ed McStay]

a few weeks ago my retarder brake stopped working and now its time to
look for the problem. i have looked at the prints and info in the files
and it tells me to check the 6amp fuse in line to the switch. can
anyone tell me how to fine this fuse or do you know where it might be.
it is a pain in the b---, but i hope that is the problem. i have
checked the 12volt power to the retarder itsself and i have the
required power. i have not opened the contact box yet and hope that i
dont have to. the lever that controls the brake is mounted to the side
of the trans shift lever box and has 5 wires running to it. anyone that
has worked on this type unit and can help please chime in. thanks to
all that share their knowledge with others.

ed and peggy mcstay
83fc rb 35ft.
"lonesome dove"
lake charles, louisiana