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Carlton, Lets start with: 1) While a good and fully charged 12 volt battery ought to read around 12.6 volts sitting, it could still have problems which would cause the voltage to drop extremelyyyyy yyy low (to low to crank the engine) when you apply a heavy load such as a starter. You need to have a battery shop Load Test to really know what shape its in and/or try another known good substitute battery or a jump n see what happens. Insure theres electrolyte above all the plates and that no cells exhibit a gray or milky color indicating a bad cell. 2) Once you know the battery is good and/or you tried a good substitute or a jump n she still dont crank (and you already said the starter n solenoid checked out) the next thing I recommend is you remove, clean n wire brush, then reattach each n every battery n starter n solenoid n ground connection CUZ A BAD OR CORRODED OR LOOSE CABLE OR GROUND OR BATTERY TERMINAL MAY WELL BE THE PROBLEM !!!!! !!!!! ! 3) You asked about the switch, you can by pass test that by momentarily applying hot battery voltage (like from the battery cable side of the solenoid) using a jumper wire over to the lil S activation terminal on the solenoid which should activate the solenid to pull it in to engage the starter motor. Thats hot wiring or jumping the solenoid in case the starter switch isnt putting voltage to the solenoids lil S activation terminal like it ought to. If hot direct jumping the solenoid makes her crank yet the start switch doesnt, then the sawitch is bad or its wire down to the solenoid is bad. The switch is easily tested by placing a test lamp on its To starter terminal n seeing if its lights up in the start/crank position as it should. Be sure it has voltage to its BAT input terminal and check the wire from it to the solenolids lil S activation terminal cuz if the switch checks good but theres no voltage getting to the solenoid then that wire may be bad/open. 4) It may be possible depending on access and room to manually jumper cable around the solenoid (in case its bad) by jumping hot battery voltage either direct from the battery or where the big battery cable attaches over to the starters big input post (same place as solenoids output post) but thats a high current and arcing connection so take care !!!!! !!! SUMMARY: Check the battery and/or have it load tested and try a known good substitute,,,,, ,,insure alllll l cables n grounds n battery connections and the starter n solenoid connections are good n tight n not loose or carboned underneath (remove n clean n wire brush alllll ll of them especially the Ground) YOU MAY JUST HAVE A BAD GROUND OR LOOSE OR CARBONED CONNECTION,,,,, ,,,,,test the ignition switch n its wiring and try to hot wire the solenoid. Best wishes n God Bless John T
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