No cruise no high idle for pto

GMC guy

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Gmc
C5500
2005
250k
6.6
My fast idle stopped working for so long i forget what the switch looks like. But i need it for my pto. I also need to find my cruise control fuse/breaker/relay. Not sure which it is but most things in fuse boxes inside truck are metalic. They look like fuses. There are some fuses under hood along with relays, but none labeled cruise or fast idle...in all fuse boxes