mercury ignition coil questions

[cuenta619]

Hi guys my dude is about the ignition coil
How many volt needs because I check the volt with the engine run and the wire that deliver positive to ignition coil only have 8.5 volt from switch box is this normal or need have 12 volt
The red & white wire in the switchbox have 12.8 each.

 

[Fun Times]

Hi there, you forgot to mention what engine model and year you are working on?

 

[cuenta619]

Hi there, you forgot to mention what engine model and year you are working on?

is a mercury 140 hp 1978 6 inliner

 

[Faztbullet]

Output to coil is around 100+volts...sounds like trigger problem...

 

[cuenta619]

Output to coil is around 100+volts...sounds like trigger problem...

I mean input
the wire that supplying power to coil

 

[Chris1956]

The power to the coil is pulsed, likely about 300V. It is likely a standard voltmeter cannot measure it because the pulse rate is very fast. What issue are you having? Still an intermittent trigger?

 

[cuenta619]

The power to the coil is pulsed, likely about 300V. It is likely a standard voltmeter cannot measure it because the pulse rate is very fast. What issue are you having? Still an intermittent trigger?

I can't ajust right the idle under 800 rpm in gear the engine die
And the switchbox wire to coil only show 8.5 vol only want make sure the switchbox work fine

 

[cuenta619]

 

[Faztbullet]

If its running its working, and a battery CD ignition system the imput to coil is around 100+ volts....

 

[Chris1956]

800 RPM in gear is fine for idle. On that old a motor, that may be the best you can do.