| Wigwag Flashing Lights - Negative Input/Positive Output - Isolate Left and Right Lights |
By placing a load on the flasher with a hidden 12V light bulb, power resistor or rheostat, the flasher will cause the coil of the top relay to energize and de-energize and in turn alternate 12V+ to each of the two top right relays/light for as long as terminal 85 of the bottom relay is connected to ground via a switch or an output from an alarm, keyless entry, etc. The rheostat will allow you to control the flash rate, the power resistor and the 12V light bulb will not. On most German vehicles, if not all, you will not need to isolate the left and right lights from each other via the two top right relays as shown below.
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