K ENWORTH T680 MIRRORS - SERVICE MANUAL 7.2. VOLTAGE AT HEATER TERMINALS Check for voltage between the connectors on both sets of connectors when the heater is switched on. V V 7.3. HEATER FOIL CHECKING Measure the resistance of the heater foil in question. Compare your measurements with the table below. Ω Ω 7.4. TRUCK CONNECTOR CHECKING When the heater is switched on measure voltage between cavities “1” and “8” If no voltage is recorded then problem is inside the cab. V Copyright © Lang Mekra North America 2014 Page 21 of 28 Revised: 03/2014 Type Mi n Nom Max Main 3.8 Ω 4.4 Ω 5.0 Ω Convex 6.2 Ω 7.1 Ω 8 Ω