As I noted down below, if you have a 12 volt coil and NO external series voltage dropping (12 to 6) Ballast Resistor that you can by pass while cranking (to increase spark energy) theres less you can do. Thats the advantage of using a 6 volt coil and the ballast by pass while cranking, because when the battery voltage drops you can still apply plenty of voltage to the coil (via ballast by pass system) for improved starting..
SO WHAT CAN YOU DO, heres a few things
1) Use heavy oversized battery n starter n ground cables to reducde voltage drop while cranking.........
2) Use a good high CCA battery which doesnt drop as much voltage while cranking.
3) Use oversize wire (like 12 or 10 gauge) from the Ignition switch to the coil and coil to distributor. CHECK ALL CONNECTIONS
4) MAKE SURE THE IGNITION SWITCH ISNT FAULTY/RESISTIVE and all the wiring and connections in the LV ignition primary are good.
5) Make sure the starter isnt drawing excess current and dropping battery voltage to an excess
A clamp around ammeter can show the ignition primary current, typical would be around 4 amps. A voltmeter can measure voltage drop across an ign switch (ideally you dont want any) or an ohm meter can meassure the resistance through the closed switch (ideally very low NEAR 0 ohms)
An easy way is just to use a jumper wire to by pass the switch and hot wire the coil to see how she does then, that can eliminate any faulty/resistive switch contacts.
Turn her on and with the points closed measure the voltage on the battery,,,,,,the switches BAT INPUT,,,,,,,The votage on the switches IGN OUTPUT,,,,,,,the voltage getting to the coil,,,,,,, IDEALLY they should all be the same but when you start seeing drops, you have found the guilty component or connection or switch etc thats dropping voltage. THATS AN EASY TEST DO IT !!! Measure voltage at all those locations to find the voltage robber grrrrrrrrr
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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