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Old 12-08-2011, 06:04 PM
HOTWRENCH HOTWRENCH is offline
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Join Date: May 2004
Location: saxton pa.
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Talking WIRING

Some of these old trucks would burn the wires off the back of the ignition switch, they use to make a replacement plug to replace the bad one. This truck may or may not have fuseable links , usually located at the starter solenoid. If you have power coming to the F terminal of the alternator and aren't getting out at least 13.5 volts at the bat terminal of the alternator . This usually points to the aternator itself. If there is no power to the field (F} terminal this points to the regulator. Most of the electronic regulators have a wire that has power when the ign switch is on , one that has 12v from the battery for sensing voltage, and the {F} wire going the the field terminal of the alternator voltage varies with output demands. To check the alternator a hot jumper wire connected to the field terminal will let the alternator produce full output.

Have A Great Day --- Hotwrench
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FERGUSON'S GARAGE est. 1967
car , truck , heavy equiptment repairs
4 X 4 specialists PORTABLE WELDING SERVICE
TOWING New @ used PARTS
1981 L 800 460 5 speed , 2 speed rear
1957 F 600 390 5 speed
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