TM  10-3930-638-24&P 2-31.   SENDING   UNITS   AND   SWITCHES   MAINTENANCE   (cont) e. Stop Light and Hydraulic Filter Swtitches (cont) (2)  Stop  Light  Switch  (cont) STEP LOCATION ITEM ACTION REMARKS CLEANING  (cont) 2 Wire leads and switch Clean Use cleaning solvent P-D-680 on terminals terminals and connectors only INSPECTION 3 Wires Inspect Replace if insulation frayed, or if conductors broken INSTALLATION 4 Hydraulic  brake a. Stop light switch Install  and Turn  clockwise  until  securely  mounted valve, bottom tighten to  hydraulic  brake  valve rear of vehicle b. Two wire leads Install Push on switch terminals c. Two wire leads and Seal Use silicone rubber seal terminals 2-174