May 2005
no year car stated, how sad that.. no?
which box, cab or engine bay, wow. 2.
wow 3 no amp size stated by you, must we guess this too?
all fuses blow for 1 reason
a short on that POWER FEED.
and prevents the FIRE , that no fuse, would cause.
that is its purpose.
when they blow we use this $20 tool
to find it, called and AMMETER.
ask?
this page shows all ways to find it, on all suz.
http://www.fixkick.com/power-elect/blows-fuse.html

ex. are 89-98 years but the methods work on all cars, boats, planes and trains. (i learned on boats when young, 400ft boat )

its not hard to find, once you learn the different ways.
there are 3 ways. (macro)
1:remove all loads, add them 1 by one until it blows fuse.
have boxes of fuses handy. less this way.
2; remove loads, 1 by 1 , finding the offender. (lots of fuses this way, )

or use a circuit breaker, (ATC adaptor) and find the short this way.
here ill guess which box this is.
F1:
engine bay F1 is 100 amps. that?

F1 in the cab is called F10, starts at 10, not 1.
and is Tail fuse, it marked TAIL, and is headlamp relay 2.

if car is in canada, with DRL lamps, different answers !!!

F1 blows 100 amps only, it blows , if the alternator shorts.
or someone skipped step one playing with it, in any way.


next time tell the HELPER exactly where hands are at
under hood
or under dash.
or omg, a photo of the thing,,,, really.

It sounds like a dead short somewhere in the ignition circuit or the "main" circuit. If everything else on the car dies (lights, chimes, instrument panel, etc) when that fuse blows, that would most likely be the main fuse you've identified. It's going to be a serious pain to find that short, and I'm sorry I don't have any real leads as to what it could be other than tracing the wiring back. Whatever you do, DO NOT replace the fuse with one of higher amperage... The wiring will surely melt or even worse, catch fire!