S&S Cycle IST Ignition System for 1984-1999 Big Twin and Custom Applications User Manual
Page 10
NOTE: Locking tabs on each connector listed should produce a light “click” sound when properly assembled. S&S recommends checking each connection
by lightly pulling on each half of the connector to ensure that the locking tabs have properly seated.
h. Route harness segment (f) (See Picture 13, previous page) of the S&S® harness towards the coil.
i Attach supplied separate coil wiring pigtail (also item “f”, but in picture 1 to main harness segment (f) in Picture 13).
Table 1, below right, shows the wire color codes that should be matched to the ignition coil. Install each ring terminal under the
corresponding screw. Do not allow the screws or ring terminals to touch each other or any other metal. See Picture 14, below left.
j. Route harness segment (g) (See Picture 13) of the S&S harness to the long pigtail of the Cam Position Sensor and attach the connector.
Avoid routing this wire segment near coils or spark plug wires.
k. Locate harness segment (h) (See Picture 13) of the S&S harness so that it can be easily accessed by a scantool to check any fault codes
that may occur. See Picture 15, below.
l. Permanently reinstall tank, reconnect battery (positive cable first) and any other portions of the motorcycle that have been removed or
disconnected.
7. IST Wiring Adapter for early model and custom installation.
NOTES:
• This section is only for motorcycles without an existing 8-pin ignition connector.
• If the IST Ignition will be installed on a motorcycle with an existing 8-pin connector, the following harness adapter installation instructions do not
apply.
• The IST wiring harness adapter allows installation of the IST ignition on a post shovelhead/pre-8-pin connector wiring harness (1984 to 1994
carbureted).
• The harness adapter is also for any custom built carbureted (1984-1999 design) motorcycle.
• In theory, it appears that the IST Ignition with its nosecone mounted pick-up should be adaptable to any Harley Davidson® big twin motor built since
10
Picture 14
Picture 15
Table 1
Wire Color
Coil Terminal
Designation
Main
Stripe
White
Black
Battery “+”
Yellow
Blue
Rear Cylinder
Blue
Orange
Front Cylinder