NOTE
See Figure 4-28. The seal cap protects the TGS terminals from dirt and moisture and also serves as a retention device for installation of the throttle grip.
1. Verify that seal cap is installed at end of twist grip sensor.
If seal cap is not present, it may remain inside throttle grip.
a. Check condition of O-ring on seal cap. O-ring is only available as part of the seal cap assembly.
b. See Figure 4-28. Install seal cap engaging legs in slots at end of twist grip sensor.
2. Mate TGS connector to TGS jumper harness.
3. Models with heated hand grips: See Figure 4-27. Mate the interconnect harness connector (2).
4. See Figure 4-29. Gently draw jumper harness into handlebar while guiding TGS into end of handlebar. Align index tabs on twist grip sensor into slots in handlebar.
Verify that the TGS is completely engaged into the slots in the handlebar.
5. Position hand grip so any cosmetic features are properly positioned. Install the hand grip and rotate to verify that internal splines are engaged with the twist grip sensor.
6. Models with heated hand grips: Install hand grip and connect heated hand grip connector.
See 2.28 HANDLEBAR, Heated Hand Grips. Install end cap.
NOTE
Always follow the procedure in 7.37 HANDLEBAR SWITCH PACKS when installing right switch housing to be sure the twist grip operates correctly.
7. Install switch housing and brake lever/master cylinder assembly. See 7.37 HANDLEBAR SWITCH PACKS.


8. Connect TGS jumper harness connector.
9. Road King models: Install handlebar clamp shroud and headlamp. See 2.47 HEADLAMP NACELLE: ROAD KING MODELS. Secure TGS harness and brake line to right handlebar riser with a new cable strap.
10. Fork mounted fairing models:
a. Rotate inner fairing. See 2.39 INNER FAIRING: FORK MOUNTED FAIRING MODELS, Rotate Inner Fairing.
b. See Figure 4-24. Connect TGS connector.
c. Install outer fairing.
d. See Figure 4-31. Loop TGS jumper harness across handlebar. Secure with new cable straps (1).
11. Frame mounted fairing models:
a. See Figure 4-25. Connect TGS connector (1).
b. Secure TGS harness with new cable strap.
c. Install instrument bezel. See 2.40 INSTRUMENT BEZEL: FRAME MOUNTED FAIRING MODELS.
12. If present, install two cable clips on handlebar switch harnesses into holes in handlebar.
13. Install main fuse.
NOTE
Whenever a new TGS (or ECM) is installed, idle speed must be reset. The ECM uses the first four ignition cycles to establish the optimum idle speed. If the procedure is not performed, initial performance problems may result.
• Place the engine run/stop switch in the RUN position.
• Turn the ignition/light keyswitch to IGNITION and then back to OFF four times without starting engine. Allow at least three seconds to elapse between ignition cycles.