Burning Main Fuses

[MrMarty51]

Pulled the under hood fuse/relay panel.
Does not look feasible to remove the underneath cover over the electrical contact for the ECM A and ECM B fuse connections.
The black plastic cover has no signs of excessive heat so back together the fuse panel goes.
Put this unit back together and runner till she blows.

 

[dbrannon79]

How does the contacts look where the fuse plugs into? strange there should also be a 25amp fuse in the dash panel that runs the blower. also powers the ac controls too. I bet that 50amp fuse also powers other things in the cab too. something you can do to check how good the contact is would be to take one of the old blown fuses and split it in half were you have that one spade to plug in. feeling for how much clamping force and resistance the spade had on the contact in the fuse box. then pull another and compare.

if it feels looser compared to other slots. sometimes but not always you can shimmy a L shaped pic in there behind the female pin slot and pry slightly to make it a tighter fit. if the female pin gets too hot the contact can deform and loose it's grip on the fuse thus creating a worse connection and more heat that eventually leads to melted plastic around that connection.