(27) BRAKE OIL TEMPERATURE The brake oil temperature gauge indicates the temperature of the rear brake cooling oil during operation. Maximum operating oil temperature is 250 o F (121 o C). If oil temperature exceeds this maximum, Brake Oil Temperature Warning light (48) will turn on. As quickly as safety will permit, bring the truck to a complete stop away from traffic, move transmission range selector to "Neu- tral", apply the parking brake, and run engine at high idle. Continue to run engine at high idle until Brake Oil Temperature Warning light turns off and brake oil temperature cools to below 250 o F (121 o C).
If temperature does not return to this range within a few minutes, report the condition immediately to maintenance personnel and wait for further instructions before moving truck. (28) VOLTMETER The voltmeter indicates the output voltage of the battery charging alternator. Normal indicated voltage at high idle is 27 -- 28 volts. When the key switch is "On" and engine is not running, the voltmeter indicates battery voltage. (29) SPEEDOMETER The speedometer indicates the truck speed in miles per hour (MPH) and kilometers per hour (km/h). (30) LEFT TURN INDICATOR (Red Light) This light flashes to indicate that the left turn signal lights on the truck have been activated.
It will also flash simultaneously with right turn signal indicator (32) when "Hazard" switch (on steering column) is On. (31) HIGH BEAM INDICATOR (Blue Light) The high beam indicator light, when lit, indicates that the truck headlights are on "High" beam. To switch headlights to "High" or "Low" beam, pull lever-operated dimmer switch (turn signal lever) and release. (32) RIGHT TURN INDICATOR (Red Light) This light flashes to indicate that the right turn signal lights on the truck have been activated. It will also flash simultaneously with left turn signal indicator (30) when "Hazard" switch is On. HB5014 4/94 Instruments and Controls HB5-7