MSD Radio Frequency Interference Tech Bulletin - Manual (Page 2)

AUTOTRONIC CONTROLS CORPORATION • 1490 Henry Brennan Dr., El Paso, Texas 79936 • (915) 857-5200 Fax (915) 857-3344 • Website: www.msdignition.com
FRM23758 Revised 07/02 PRINTED IN U.S.A.
Supply Line noise is caused by varying loads of the
vehicle’s supply voltage. These variances are amplified
through the radio’s 12 volt supply wire and are heard through
the speakers. Supply line noise will be audible on AM and
FM as well as during tapes or CDs. For Supply Line noise,
the MSD Noise Capacitor, PN 8830, will help.
The Noise Capacitor will act like a filter on the heavy
power supply wires of the MSD. The MSD will draw its
power though the filter keeping all of the other accessories
separate which prevents supply line noise. A side benefit
is that the Capacitor will protect the MSD Ignition from
voltage spikes or current surges.
Figure 3 - Installing the MSD Noise Filter Capacitor PN 8830
Figure 2 - MSD Noise Filter PN 8830.
Installing the Noise Filter Capacitor
1. For best results, it is recommended to mount the Capacitor as close as possible to the MSD Ignition Control. Find
a secure mounting point and mark the location of the mounting holes. Use a 3/16” bit to drill the holes and use the
supplied screws to mount the Capacitor.
2. It is recommended to cut the MSD wires and install high quality Ring Lug terminals. The MSD power wires are 12-
gauge.
3. Attach the Red wires to the positive terminal and the Black wires to the negative terminal as shown in Figure 3.