fuse and the truck dies. There is a blue wire that runs from IGN to the ECM B
fuse (10 amp). I took the wire out of the ECM B fuse and the truck will not turn
I don't know about your blue wire, but it does seem important.
The high blower setting on your truck has its own circuit (apart from
the resistors that control the first three steps). This circuit is
controlled by a relay under the hood mounted right by the blower
motor. Also, if your S-10 is like any other, it may need a new blower
fan switch. They corrode, increase resistance, and then melt. If this
is the case, in addition to the switch you will also need the pigtail
(wires from the harness) and connector, as it will still be corroded
whether or not you replace the switch.
Many people despair of finding such a pigtail, and resort to
junkyards, but this is a not a good solution as the connectors in the
junkyard are already corroded. NAPA does sell this part no matter what
they say. I had to go to the distribution warehouse here, but I
finally got them to find one and sell it to me. I imagine LMC Truck
(they have a website) also has it, but I have not bought from them.
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