Glow plug fues blowes

did u replace the relay just a curious question, sometimes they have rust and water in the inside of the relay but my guess would be that you have a bare wire rubbing somewhere, causing the fuse to blow, anything significant has happened before that issue?

Then you have a shorted glow plug timer most likely.

More than likely you have an internal fault either in the fan itself or the thermostat that activates it.

For a fuse to blow it has to have a lot higher than normal current draw through it, which is normally refered to as a short. If the fuse blows almost immediately then I would suggest you unplug the fan, and see if the fuse blows with just the thermostat in the circuit. If it blows - replace the thermostat control. If it doesn't blow, plug in the fan and watch it. If it trys to start and then blows the fuse, replace the fan motor.

Well, there's not all that much that can go wrong with a glow plug circuit to cause it to blow a fuse. One or more shorted glow plugs will do it (unhook them and use a multimeter to measure resistance at each glow plug terminal to ground, zero or almost zero resistance will show the culprit), as will a pinched or bare wire between the relay and a glowplug.

The relay itself can also short out- check it while you're under there. You may have to unhook the wire that actuates the relay to get a correct reading. Turning the switch to the glowplug position with the relay unhooked will show you whether or not the wire from the switch to the relay is good.

lp

replace the relay for the glow plugs,its expensive

what is that fuse for? If it keeps blowing then it is an indication of a short cicuit in the part/cable/wire for the unit the fuse protects.

check your fues socket main wire if it not getting sparked or is broken in between...

First I suggest confirm what fuse blowing there and waht circuit and edevices are controled, check some wire broken or bad ground in the line and switch (if have one there).

Keep us updated.

crank or cam sensors have nothing to do with fuel delivery

disconnect your glow plug relay and try it, the relay may be shorted out