The objective is to measure peak AC voltage (adaptor converts to DC volts) at 6 key points in your Mercury V6 outboard ignition system. Before you begin, ensure you have a strong spark and good compression before proceeding to the Peak Voltage Tests (with the Buckshot Racing #77 DVA Adaptor).
Plug the adaptor into your multimeter, set to read over 300 volts DC.
When using a DVA (Direct Voltage Adapter) to test ignition components on an outboard motor, always set your multimeter to DC volts, not AC.
Although the ignition system produces AC voltage, the DVA converts those fast AC pulses into a steady DC signal representing the peak voltage.
Multimeters can’t accurately read those quick AC spikes independently, so the DC setting allows you to see a reliable, peak voltage reading for proper diagnostics.
Run tests stationary in a safe place, in the order listed on the chart, with grounds connected. Stay clear of voltage shocks and fuel.
Test #1 is key. If you can confirm all cylinders read within the spec above and within a close range of each other while cranking, move to confirm in the same way with the motor running.
Typically, we'll see 200 increasing to 220 volts while increasing the RPMs to around 3,500. If you get this far with passing grades, you have confirmed your ignition most likely has no other issues, and it might be time to look elsewhere.
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