DISTRIBUTOR SERIES SUITABILITY:

ALL E-SPARK & UNILITE DISTRIBUTOR SERIES NOS. 37, 38, 45, 46, 47, 83, 86, 91, 93

ALL E-SPARK & UNILITE BREAKERLESS ELECTRONIC CONVERSION KITS

ALL MBI DISTRIBUTOR SERIES 42, 50, 57 AND 87

ALL MBI BREAKERLESS ELECTRONIC CONVERSION KITS

ALL E-SPARK & UNILITE HYFIRE ELECTRONIC CONVERSION KITS

*** The Circuit Guard is designed for UNILITE, HYFIRE and MBI distributors and conversion 

kits that experience failures with the ignition modules from voltage spikes (voltage 

transients, power surges). Voltage spikes are associated with “noisy” electrical systems 

from electrical defects such as worn alternator brushes, corroded or oxidized electrical 

connections and similar electrical problems. Voltage spikes are clamped and regulated by 

the Circuit Guard from damaging the HYFIRE ignition module.

NOTE: 

THE CIRCUIT GUARD DOES NOT RESOLVE FAILURES WITH HYFIRE, MBI AND UNILITE IGNITION MODULES ASSOCIATED WITH: 

a.) THE ABSENCE OF AN IGNITION BALLAST RESISTOR IN APPLICATIONS THAT REQUIRE AN IGNITION BALLAST RESISTOR;

b.) IMPROPER WIRING.