Wisconsin — Solid State Ignition Distributor Testing (Voltmeter)
Testing & diagnosis
From a Wisconsin service manual covering: FM-X4B7D, V-460D, V-461D, V-465D, V460D, V461D, V465, Y-128-S1, YB-85A. Check it applies to your exact model before use.
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Before you start
- Disconnect ground (negative) cable when charging battery.
- Do not reverse battery cables; negative ground system only.
Procedure
- Connect voltmeter positive lead to negative side of ignition coil; ground negative lead; set to DC volts on at least 15 volt scale.
- Disconnect high voltage wire from center of distributor cap and ground it to engine block or chassis.
- Crank engine.
- Voltmeter should fluctuate from 1 to 2 volts to 10 to 12 volts as engine is cranked.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Voltmeter fluctuation 1 to 2 volts to 10 to 12 volts
- Constant 0 reading = open primary circuit
- Constant 1.0 to 3.5 volts = electronic module shorted
- Constant battery voltage = module open circuit, replace
Source: Wisconsin service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.