R1224 Regulator
Installation Instruction
12-1001 24-30-01
Rev. M: 01 Dec. 2021 Page: 6-15
© 2021 - Hartzell Engine Technologies - All rights reserved
6.17 Regulator Installation Guide-N
A. General
Replacement of Jasco J12M20SP (12V) or J12M24SP (24V) regulators.
B. Prepare the replacement regulator
(1) Use R1224J, ensure regulator jumpers are set to match aircraft battery voltage (Fig. 6-1).
(2) Add jumper between ENABLE and AUX terminals (Regulator side only).
C. Replace the regulator
(1) Remove the old regulator and if present separate voltage protector.
(2) Remove the load resistor connected between the regulator and the aircraft bus or alternator output used
with 24V Jasco regulators.
(3) Install R1224J in same location using existing hardware.
(4) Connect ENABLE to the regulator/field power source (the wire from the cockpit ALTERNATOR FIELD
switch which is fed from a 7.5 amp breaker).
(5) Connect regulator FLD to alternator FIELD terminal.
(6) Connect regulator GRND to alternator GRND terminal.
(7) Remove all disconnected and unused wires.
(8) Adjust voltage as necessary with engine running and alternator enabled.
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