Shielding Ignition Coil

Remove coil and bracket from engine. Install a shake proof washer (E) between ignition coil and the bracket for a good ground connection.

Clean paint from bracket (F) and engine where bracket is mounted to assure a good ground connection.

Install a .1 MFD Coaxial capacitor (G) on the ignition coil's positive terminal as close to positive terminal of coil as possible.

Clean bracket and solder (H) a .005 MFD 1000 volt ceramic disc capacitor (I) to the bracket. Connect other end to negative terminal of coil.

Shielding Alternator

The alternator will produce a "whine" sound, much like a siren as engine RPM is changed.

Install a 2.0 MFD feed thru coaxial capacitor between the B+ terminal on the alternator and the B+ lead from the motor cable.

The current rating (amps) of the coaxial capacitor must be higher than the current (amps) rating of the alternator.

Shielding the Voltage Regulator

Voltage regulators will sound much the same as ignition noise, varying with engine RPM. However, when the ammeter indicates full charge, the noise will not be heard. As the ammeter "cuts-back" to reduced charge, the noise will begin. Loading the battery by using lights, motors, etc. will cause the charging system to function. Turn off these loads, and when the battery is fully charged the charge rate will "cut-back" giving you a chance to Verify the noise source.

Install a .5 MFD by-pass capacitor (J) to the B+ (purple ) lead (K) of the voltage regulator. Solder capacitor lead (L) to the B+ lead of voltage regulator (tape to protect from moisture). Install the capacitor on the regulator(M) if possible. Add a shake proof type washer (N) between the bracket of the capacitor and the voltage regulator for a good ground connection. Clean engine ground where voltage regulator mounts to engine.