TM 9-2320-361-20 6-4. FRONT-WHEEL DRIVE LOCK-IN SWITCH MAINTENANCE (Contd) FOLLOW-ON TASKS: Install front-wheel drive lock-in indicator and air pressure switch (para. 4-36). Connect battery ground cable (para. 4-48). Start engine (TM 9-2320-361-10), build up air pressure, and check for leaks. 6-19