1985 XJ6 keeps blowing 35 amp brake light fuse?

Answer 1

A fuse is a safety device designed and intended to sense, and "blow" to prevent more current [measured in Amps] flowing through a conductor [wire] than the wire is capable of carrying. When multiple replacement fuses continue to blow, that occurance indicates excess current flow in that circuit. Excess current flow ["load"] can be caused by a short circuit, or by having too many devices, or devices that are too large, in the circuit. For example, one cause of excess load is the use of lamps [bulbs] that have a larger filament than the lamp intended for the circuit. Another cause is the addition of more lamp fixtures [sockets] than the circuit was designed for. A common example of this is adding many brake light fixtures, or a series of of off-road headlamps. IF a fuse were to fail to blow under a short circuit or overload condition, it is certain that the vehicle wiring system will be damaged, and possible that overheating of the wiring could cause the vehicle to catch on fire. A circuit which repeatedly blows fuses MUST be analyzed by a COMPETENT electrical technician in order to determine the fault, and then PROPERLY REPAIR the fault.