Quote:
Originally Posted by T77911S
the resistance IS the fuse/contact of fuse to fuse block.
resistance=heat
when you have a high current circuit and the fuse/fuse block has resistance, more heat is created, along with a voltage drop.
what i did on my fuse block was to remove each fuse, clean the ends with a fine sandpaper (you could even replace them) and clean the contacts on the block. then i removed each wire to the fuse blocked and cleaned the wire ends. then i cleaned the screw that holds the wire in place. if there was someway to clean the hole the wire slides in, i would.
this should reduce the resitance at the fuse block and help to cut down on the heat.
my fuse blcok was gettting rather warm, mainly due to the fuel pump.
another hi current load would be anything with fan motors or the headlight circuit.
some of those wire ends in that pic dont look too good.
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I have found it not at all unusual for the spring ends holding the fuses in place AND providing the electrical connection to lose their "springiness" over time. My first experience was with the fuel pump fuse.
There are 2 issues that need to be brought up.
1.) the HIGH startup surge currents, often substantually exceeding the actual fuse rating of some devices, fuel pump, etc.
2.) "Switch off" of inductive devices result in a HIGH voltage spike, likely the primary cause of the failure A/C control thermstat contacts.