Mallory Ignition Mallory WINDOW RPM ACTIVATED SWITCH 628 - Manual

WINDOW
RPM ACTIVATED SWITCH
PART NO. 628
INSTALLATION INSTRUCTIONS
Parts Included in this kit:
1 RPM Activated Switch Part No. 628
1 “U” shaped crimp-on wire terminal
1 #6 x 1⁄4" sheet metal screw
2 #8 x 1⁄2" sheet metal screws
General Information............................................................ ...1
Mounting Procedure........................................................... ...2
Wiring Procedure...................................................................2
RPM and Cylinder Setting Procedure....................................3
Wiring Diagrams for the RPM Activated Switch
Connecting to a HYFIRE ® IV.................................................5
Connecting to a HYFIRE ® VII.......................................... .....6
Connecting to relays with a HYFIRE ® VII.............................7
CONTENTS
Connecting to a Timing Retard............................................8
Connecting to a Timing Control...........................................8
Connecting to a Light...........................................................8
Connecting to an Electric (Shifter) Solenoid.................. .....9
Connecting to a Nitrous System........................................10
Connecting to a Nitrous System and Timing Retard.........10
Shifnoid Wiring............................................................... ...11
The Mallory 628 Window RPM Switch is an RPM switch that is triggered from the tach terminal available on most
aftermarket performance ignitions. It will not only activate at a particular RPM, but can also be set to de-activate
at a second, higher, RPM. It can be used on 4, 6 (even-fire only), and 8 cylinder engines.
NOTE: The Mallory 628
CANNOT be triggered from points or electronic distributor. It must be triggered from a tach output terminal.
The 628 features two independent sets of switch contacts that switch other devices on or off when the selected
RPM is reached. These contacts draw a maximum current of 5 amps. To switch more than 5 amps, you must use
the RPM Activated Switch output to drive a high current relay, such as a horn or headlight (see illustrations).
NOTE: The switch contacts are NOT connected electrically. This allows you to turn one circuit on and anoth-
er off at the same RPM.
GENERAL INFORMATION
®
MOUNTING PROCEDURE
Step 1
Disconnect the battery (–) cable to cut power to the system.
Step 2
Mount the unit in an area away from hot engine components or extreme heat, such as exhaust manifolds, and
away from moving parts, such as fans, belts, and linkages.
Step 3
Mount the unit using supplied # 8 x 1⁄2" sheet metal screws.