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Turn ignition switch off and disconnect battery ground cable. 2. Refer to Figure 3. Remove OE ignition module and wire harness (items 1-4). You will disconnect two wires at the coil (15), a wire going to the VOES (Vacuum Operated Electrical Switch) (18), a black ground wire at the ignition module, and the 3 pin plug (20) that connects to the sensor plate (11). Refer to shop manual for locations. 3. Remove ignition cover plates and gasket (items 5- 9). This will require drilling out two rivets. The rivets will later be replaced with two supplied self- threading screws. 4. In order to remove the sensor plate cable, the cable plug (20) must be removed first. Use needle nose pliers to pull the terminals out of the plug. Then pull the cable through the exit hole at the bottom of the timing cover. 5. Note location of sensor plate (11). There is a V notch in the sensor plate used for alignment. When you install the HI-4, you should align the V notch in the same location. This should set the timing close enough to start the engine. Remove and save the two standoffs and washers (10). Remove the sensor plate (11). HI-4 INSTALLATION Refer to Figure 4. The HI-4 requires use of the OE timing rotor P/N 32402-83 (used only on 1985 and newer models). If you have an older model or are not sure, check the rotor (9) for the correct part number. For models prior to 1980, use the supplied 10-32 x ¾”bolt and washer to mount the rotor. 1. Install the HI-4 system in place of the OE breaker or sensor plate. Rotate the HI-4 about 90 degrees to give better access to the cable exit hole. Install the HI-4 first, then push the cable through the hole. On some early models it may be necessary to enlarge the wire harness exit hole in the gear cover. Align the V notch on the HI-4 same as the OE plate you removed. Use the OE standoffs to secure the HI-4. You must use lockwashers under the standoffs for proper clearance between the HI-4 and cover plate. Do not fully tighten the standoffs until the timing has been set. 2. Route the HI-4 wire harness along the frame rails up to the coil. Make sure that harness will not be chafed or burned by exhaust heat. Secure harness with tie wraps. Do not install timing cover. HI-4 HOOKUP Crimp terminals and hardware are supplied for your convenience. Use the ring terminals for coil hookup. Use male-female quick disconnects for connections to the tach and vacuum switch (VOES). Tape up any unused wires. 1. Circuit Breaker Cover Screws (2) 2. Circuit Breaker Cover 3. Circuit Breaker Cover Gasket 4. Breaker Plate Screws (2) 5. Breaker Plate Screw Lockwashers & Washers (2 each) 6. Retainer (1971 to early 1972) 7. Circuit Breaker Cam Bolt 8. Breaker Plate Assembly 9. Breaker Cam 10. Advance Assembly 11. Gear Case Cover 11 10 9 8 7 6 5 4 3 2 1 NOTE: Damage will result if the brown tach wire comes in contact with +12V. Figure 1. Harley-Davidson®OE Points System
9000-4002A REV A 3 2/05 1. Identify switched +12 volt wire and tach wire (if equipped) going to the coil. Refer to your service manual, or reconnect the battery and use a test light or voltmeter. The switched +12 volt wire will be hot when the ignition key is turned on. 2. Refer to Figure 5. Connect the HI-4 red wire and switched +12 volt wire to Coil positive. 3. The HI-4 white wire is not used and should be taped. 4. Connect the HI-4 black wire to the Coil negative terminal. 5. Connect the HI-4 green wire to the vacuum switch (Figure 3, item 18), if used. 6. Connect the HI-4 brown wire to the tach wire, if equipped with tach. Tape up if unused. 7. The HI-4 is grounded via the timing housing; a separate ground connection is not required. 8. Reconnect battery ground cable. Verify proper ground connections to the frame and engine. VOES HOOKUP The OE vacuum switch (VOES) is normally an open circuit. Above 3-5 inch-Hg vacuum, the VOES closes and grounds the vacuum input on the OE ignition module. This increases the total advance generated by the OE ignition module. Vacuum advance improves part throttle 17 16 1. Cover Screws (2) 2. Ignition Timer Cover 3. Ignition Module 4. Timer Plate Screws (2) 5. Washers (2) 6. Screws & Washers (2 each) 7. Shield 8. Sensor 9. Trigger Rotor Bolt 10. Timer Plate 11. Trigger Rotor 12. Advance Assembly 13. Gear Case Cover 14. Ignition Coil 15. Spark Plug Wires (2) 16. Ignition Coil Terminal (FX) 17. Ignition Coil Terminal (FL) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 NOTE: Most motorcycle coils do not have terminals marked. Use either terminal for Coil+ (positive) and the other one for Coil- (negative). Warning: The HI-4 (8-1100) Dual Fire ignition will not work with 2 plugs per head, dual coil application. Damage will result if attempted. Use the HI-4 (8-2100) single fire ignition for 2 plugs per head applications
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