engine managment fuse constant blow

95 300tdi auto .....can anyone help had fuse blow on engine managment yesterday is no 3 on lower fuse panel 10amp,changed it and all was well then this morning had to do a trip of around 30 miles on way there all was good but back on to dual carridge way and fuse blew 5 times i ran out of 10amps and had to stick a 15 amp in it and it blew that luckly had just pulled in a garage so bought a hand full of 10amp fuses changed it again and pulled of dual carridge way and it was fine the 10 mile or so back home , the fuses blew when nothing else had been switched on every thing was off no brake lights indicators or any thing seems strage how blew 5 fuses on dual carridge way then was fine around town can any one shed any light on matter or where i sould start looking for problem

I've got same issue - short duration trips no problem. Longer trips and fuse blows. Engine runs without fuse, but will not start without it. Went through a few fuses one day so went for replacing fuse with 2 wires, 2 blade connectors and m+fm bullet connectors - Blades into fuse holder, a length of wire from each blade to each 1/2 of bullet connector in a position you can access whilst sat in seat. To start; select neutral, turn ignition on, hold bullet connector 1/2's together, wait for glow plug light to go out, turn key to start, disconnect bullet connectors, move off. Saves fuses until we can resolve cause of problem (unless you already have seeing your post is old)
I'm thinking it's a heater plug issue or heater plug timer relay issue. Need to do more checks, unless you/someone else already knows the answer.