From http://forum.studebakerdriversclub.com/showthread.php?53162-Avanti-Radio-Suppressor-Question A 0.5uF Cap can be installed at the BAT or ARM terminal. But not the Field Terminal. Depending on noise magnitude, a cap could be installed at the Generator / Alternator armature or output terminals and one at the BAT terminal of the regulator. No damage done at any location. Everything to gain for noise suppression. Cap case must be firmly ground to device to be effective. TT Tiger Tom