I can't find anything on an inline fuse. I looked and it may just run off the circuit breaker that is in the headlight switch itself. If you have a book that says there is an inline fuse then check behind the alternator or on the starter relay. It could also be attached to a wire on thefirewall or fenderwell by the lights in front. Our books don't go back that far so your best bet may be to go to a library and find a manual like 76 or 78 as that would be close and explain where it is.