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#11
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I like the light approach to solving this problem....... The engine is an un-molested M-18 stock configuration. Now I'm no electronics expert but I've got a question for the knowledgeable folks on this site.
From looking at the schematics it appears that there would only be two ways that the fuse could blow out. Either the Ammeter wires are shorting to ground somehow intermittently or the key switch is bad allowing current and voltage to backtrack through contacts B, R and M. Contact B & R are used when the engine is running. Contact M is for the magneto and goes to I assume ground when the engine is turned off. If the key switch is bad, contact M could intermittently short to ground. Since B & R are both connected at this point then the voltage spike from the magneto could take out the fuse? Is this a feasible explanation ? Just is case it is, I have a new switch on order. |
#12
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It's also possible that mice have gotten into the blower housing and chewed on the wires for the stator and the kill wire for the magneto and this is causing a short that blows the fuse and shut the engine down.
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Tim Pap's 100 Restored 108 1211 Dual Stick 1050 Pap's 100 restoration thread - http://onlycubcadets.net/forum/showthread.php?t=47965 |
#13
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Replacing the switch couldn't hurt. Are you sure the new fuses you are using are 20 amp slow blow?
The ammeter is held in place by a bracket with insulators that prevent your 2 hot leads from contacting ground. An insulators could be worn or missing. Check that first. The fuse is 20 amps so the ammeter should jump quite a bit when the short occurs. Turn the key on and jiggle the harness in different places while you watch for movement on the ammeter. If the oil light goes out the fuse is blown because you hit the spot where the short is. It's probably something simple like a wire rubbing on the frame and simply eye-balling the wiring should find it. Bottom line if you are going to maintain an old vehicle you should buy a multimeter and learn how it works. Understanding the basics of ohms, volts and amps will serve you well. You could use a multimeter to check for current through the fuse holder or low resistance from the red battery cable to ground (with battery disconnected).
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Rusty 149 project with: QA42 snow thrower 38" deck Barn fresh 1811 with: 44c mowing deck QA42A snow thrower 42" snow blade |
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