[jdl]

Can you give us the cavity number and amp rating for the fuse that blows? My information shows a circuit breaker for the cig-liter, if there is a problem from the breaker to the liter, it should just trip the breaker? The b+ going to the breaker may supply several systems, a problem with one of the other systems might cause problems with everything on that circuit.

Checking the fuses is good. Did you check for voltage where the fuse plugs in? Some systems are hot all the time, some go hot when you turn on the key.