A6 Quattro Wagon V6-2.8L (AFC) (1995)
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NOTE: An ohmmeter can measure resistance (or check continuity) only when the circuit is not powered, i.e. when there is almost no load.
Low Voltage:
A low Voltage reading across the two switch contacts indicates almost no difference in potential. Resistance across the switch is low - most of the
battery Voltage is passing through the switch and is still available to power the lights.
High Voltage:
Any significant Voltage reading indicates a difference in potential across the switch contacts. Excessive resistance is loading the circuit, causing a
Voltage Drop. Voltage is consumed overcoming the resistance of the switch, and less is left to power the lights.
Maximum allowable Voltage drops recommended by the Society of Automotive Engineers are:
0.0 Volt for small wire connections
0.1 Volt for high-current connections (Example: fuel pump, headlights)
0.1 Volt for ground (GND) connections
0.2 Volt for high-current cables (Example: battery/starter cable)
0.3 Volt for switch or relay contacts