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  #26   IP: 104.174.83.118
Old 03-24-2021, 08:07 AM
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I thought you might have. It's correct for measuring coil resistance (wires removed as you said) but not voltage. Despite how it is identified, the small coil '-' post is not a ground.

Run the calculation again with the new voltage measurement. Voltage is expected to be in the range of 13~14 volts. I expect the end result to be the same, "resistor not required."
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  #27   IP: 72.218.38.55
Old 03-24-2021, 01:18 PM
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Neil the Atomic 4 Whisperer:


Voltage at the coil [ + ] terminal at cruising RPM 13.5 Volts

Primary winding resistance of the coil 3.9 Ohms
(terminal to terminal, [ - ] wire removed)

Recommended resistor 0.1 Ohms

Major feeling of confidence. Thank you
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  #28   IP: 104.174.83.118
Old 03-24-2021, 04:34 PM
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Bill, I wouldn't fuss with an added resistor if I were you.

Respecting good engineering practice, the calculator adds a 15% margin of safety below 4 amps (3.4 amps target) and your setup calculates to 3.46 amps. You're good right where you are.
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  #29   IP: 72.218.38.55
Old 03-24-2021, 08:41 PM
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Smile

Thank you Neil. I was thinking the same thing. Gee wiz a tenth of an ohm? What's that like? a breath of warm air vs. cold air?

This E ignition comes from Indigo and has a resistor strapped to the coil. All PO stuff. Tom was saying it should be OK. Now I know it is OK.
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  #30   IP: 104.174.83.118
Old 03-24-2021, 09:00 PM
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In that case I defer to Indigo Electronics. It's best that they specify the recommended amperage for their product. The advice and calculator I provided here pertain to the EI product Moyer Marine offers following the manufacturer's published advisement and our testing. Indigo may choose to follow the same specification but that is for them to say.
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