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Not Firing

R

rollercoaster

Contributing Member
"Still waiting on mechanic. Di

"Still waiting on mechanic. Did some more
troubleshooting. Mercury Mariner 40 hp 4 cyl., all cyls. not firing. Removed kill wire, (black and yellow) still no fire. Need help with reading meter, new at this. Stator yellow to yellow: 50 ohms, meter set at RX1 - meter set at RX10 reads 30 ohms. Could not get any ac voltage out of stator. Trigger tests: Meter set at RX1K Br to B = 22 ohms, P to W = 22 ohms. I get 4V+ out of trigger wires. Tested R to R/W giong to switch = 10.0 volts. BL to BL/W going to switch = 17 volts. Any advice welcomed."
 
"Yellow wires come from the ch

"Yellow wires come from the charge stator windings - have zero effect on spark.

You can't test the voltage with a standard tester, need either a DVA equipped meter or a DVA adapter for a standard meter.

You obviously have the black stator model since you have the red/blue wires.

Merc doesn't list any resistance tests for this ignition. It sounds very much like your stator or your switchbox is toast but need DVA tests to confirm the stator is good or bad before you proceed."
 
"Thanks, have some tools order

"Thanks, have some tools ordered for further testing, (DVA Adapter), also ordered flywheel puller. Thanks, will let you know and I will proceed if mechanic do not get here first."
 
"On your model there are three

"On your model there are three separate components to the stator.

There are low speed windings, high speed windings and charge windings.

The yellow wires come from the charge bobbins and do not supply any power to the ignition system. They are simply there to recharge the battery through a regulator or rectifier - so testing them may tell you if you have juice to the battery while running but it's totally separate from the ignition.

The low speed windings provide power to the switchbox at lower rpms (upto about 2500) then as the motor moves above about 2500 rpms, the secondaries (high speed windings) also kick in produce extra power to the switchbox.

If your low speed windings are toast, then the motor won't start at all. If the high speed are toast you will get weak spark above 2500 rpms.

If either of the bobbins are cracked and you lose continuity when they heat up you bleed off power meant for the switchbox and you get no/weak spark.

But the charge portion of the stator may function perfectly while the ignition portion is toast (or vice versa). They are co-located, but totally separate components as far as the wiring goes."
 
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