HYFIRE® VI Series Electronic Ignition Controls Instruction Manual Part#: 685, 6851
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).
GENERAL INFORMATION MOUNTING PROCEDURE The HYFIRE VI Ignition System Part Nos. 685 and 6851 are not for marine use. Step 1 ® The RPM limiter in the HYFIRE® VI is not recommended as an engine speed governor. The use of the RPM limiters is not recommended for applications equipped with a catalytic converter. Similarly, forcing engine RPM past the RPM limiter continuously for long sustained intervals can cause fuel build up in the exhaust system that may adversely affect your application.
BASIC WIRING PROCEDURE Step 1 Refer to Figure 2 Ensure that your vehicle is equipped with a ground cable between the engine block and firewall (10 gauge or larger is required). Locate the harness with the LONG RED WIRE and one LONG BLACK WIRE at the end plate of the HYFIRE® VI Electronic Ignition Control. • Connect the LONG RED WIRE to the battery (+) post or battery (+) terminal on the starter solenoid. • Connect the LONG BLACK WIRE to engine ground or chassis ground.
FIGURE 4 MALLORY 8MM SUPPRE ® D C BA FIGURE 5 ® D CB A FIGURE 6 ® D CB A 4
FIGURE 7 ® FIGURE 8 ® 5
Connecting to Ford DuraSpark Systems (non-computer type) using Adapter PART NO. 29039 and Harness PART NO. 29040 for OEM magnetic pickup For coil-in-cap distributors only Refer to Figure 10 while performing the following steps. Refer to Figure 8 while performing the following steps. • Connect the BAT PLUG/wire to the RED WIRE. Connecting Adapter PART NO. 29039: • Crimp the YELLOW WIRE to the YELLOW WIRE of the Adapter Part No. 29043 3-pin connector.
(2b) Wiring method without adapters; all breaker point distributors; Mallory Electronic Ignitions (three wire/red, brown, green); OEM electronic ignition amplifiers.
FIGURE 10 ® D C BA LONG BLACK FIGURE 11 ® 8
FIGURE 12 ® FIGURE 13 ® FIGURE 15 Step 3 Tachometer Operation: If a tachometer is used, connect tachometer ignition sensing lead to the TACH terminal on the HYFIRE® VI Electronic Ignition Control. ® If the tachometer does not work after being connected to the TACH terminal, connect the tachometer ignition sensing lead to the GREEN WIRE from the Ignition Control Harness.
FIGURE 15 ® FIGURE 16 ® FIGURE 17 ® 10
Top Panel Operation and Features Mallory HYFIRE ® VI 685 CD Ignition System The Mallory HYFIRE® VI 685 ignition system has a number of features that are set up by using the top panel display and switches. Here is a list of the different features (or modes): To return to normal operation, select mode 1. Turn the ignition switch off. The next time the ignition switch is turned on, the HYFIRE® will be out of the tach test mode. Mode 1 – This is the normal engine protection RPM limit.
HYFIRE® 6851 IGNITION SYSTEM The Mallory HYFIRE® 6851 ignition system has the same basic connections as the 685 ignition system. However, the only accessory included is an RPM activated switch. This RPM switch is controlled by two rotary DIP switches that are located behind an access plate on the top of the unit (see the illustration below). Loosen the two screws to gain access to the switches. You can select 4 or 6 cylinder operation, and an RPM switch value from 1000 to 9900 RPM.
TROUBLESHOOTING GUIDE FOR CAPACITIVE DISCHARGE (CD) IGNITION SYSTEMS Most CD boxes operate the same way, making for common basic test procedures. Most CD ignition boxes have two separate triggering circuits in them. One is for a regular points driver signal, which is a square wave, and one for 2 wire magnetic, which is a sine wave, and the two have slightly different test procedures. Before beginning any testing, start with the basics.
7. If both of these tests prove out, then the problem is either in the distributor, crank trigger, or the wiring is incorrect. TESTING THE COIL NOTE: This test should only be done on "stock type" coils. DO NOT try this test with "CD Only" coils, such as the Mallory 28880 or ACCEL 140019 and 140010. This test is also helpful in testing the coil when used with just a distributor and you are having a "No Spark" to the plugs condition.
