FORM 1478 (REV. D) 09/2008
INSTALLATION INSTRUCTIONS
HYFIRE
®
VI SERIES OF ELECTRONIC
IGNITION CONTROLS
HYFIRE
®
VI Ignition System Part No. 685, Advanced
HYFIRE
®
VI Ignition System Part No. 6851, Basic
For applications triggered by points, Mallory Electronic Ignition Distributor (all models), original equipment electronic
ignition amplifiers and magnetic trigger pulses (magnetic pickup distributor or crank trigger ignition). Optional adapters are
available for easy connection to early model Delco/GM HEI Systems, late model GM HEI/EST Systems, Ford TFI Systems,
and OEM magnetic pickup (non-computer; Ford DuraSpark, GM HEI and Mopar/Chrysler Electronic Systems).
This product is legal to sell, distribute or install on vehicles in California. C.A.R.B. Executive Order D-70-26.
NOTE: Mallory HYFIRE
®
VI Electronic Ignition Controls are not compatible with distributorless systems or positive
ground applications. The RPM Limiter in the HYFIRE
®
VI (Part No. 685) will not work properly with odd-fire or
semi-even fire V6 applications.
Parts included in this kit:
1 HYFIRE
®
VI Electronic Ignition Control - Part No. 685 or 6851
1 Ignition Control Harness - Part No. 29348
2 Terminal Connectors - Part No. 450
1 Bypass Connector
4 Cable Ties
2 Spade Terminals
8
1
5
4
4
Ring Terminals, 1/4”
Ring Terminal, 3/8”
Spade Receptacle Terminals
10-32 Screws
10-32 Nuts with Lockwashers
WARNING: DO NOT USE NON-SUPPRESSOR SPARK PLUG
WIRES WITH THE HYFIRE
®
VI IGNITION CONTROL.
KEEP ALL IGNITION SYSTEM WIRES AS FAR FROM SPARK PLUG WIRES AS POSSIBLE.
CONTENTS
General Information ............................................................................... 2
Early Model GM HEI Systems (non-computer type,
without module) ..................................................................... 6, 8
Ignition Ballast Resistor/Loom Resistance Wire ............................ 2
Standard Ignition Bypass (Bypass Connector) .............................. 2
Mopar/Chrysler Corp. Electronic Systems
(non-computer type, without module) ................................. 6, 9
Ignition Coils .................................................................................... 2
Fuel Injection .................................................................................... 2
Spark Plug Wires .............................................................................. 2 Wiring Method Without Adapters .......................................................... 7
Breaker Point Systems ................................................................ 7, 9
Spark Plug Gaps .............................................................................. 2
Mallory Electronic Ignition, UNILITE
®
Distributors,
Electric Welding ............................................................................... 2
Magnetic Breakerless Distributors or Electronic
External RPM Limiters
Advance Distributors (3-wire/red, brown, green) ............. 7, 10
Mallory PRO TACH
®
I, IV and VI ...................................................... 2
For OEM Electronic Systems with modules/amplifiers
Mounting Procedure .............................................................................. 2
(Chrysler, Ford, and import) ............................................... 7, 10
Mounting to a Flat Surface Without Brackets ................................ 2
Magnetic Pickup Trigger Pulses (magnetic
pickup distributors or crank trigger ignition) ......................... 7, 10
Mounting to a Flat or Uneven Surface Using Brackets ................ 2
Mounting to a Flat Surface with Shock Mounts ............................ 2
Top Panel Operation and Features .................................................... 11
Wiring Procedure ................................................................................... 3 RPM Limiter Operation – HYFIRE
®
VI Ignition System
Wiring Method using Adapters and Harnesses .............................. 3
(PN 685 only) .................................................................................. 11
GM HEI Systems/coil-in-cap with OEM module) ..................3-4
Late Model GM HEI/EST Systems (external coil) .................3-5 Optional Ignition Accessories ............................................................. 11
Ford TFI Systems .........................................................................3-4 Bypass Connector ............................................................................... 12
Mounting Template .............................................................................. 12
Ford DuraSpark Systems (non-computer type,
without module) ......................................................................5-6
1
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