Does any body know what the pin assignments are on the back of a 7 inch mustang bulb? There are 3 pins on the back - however they are unlabeled. I am wiring the car from scratch so there is no original wiring harness or colour coding to go by.
To make sure, you can use a multimeter to test the pins.
- To find the low and high beam pins, find the two pins that have no continuity between them. The other one is ground (-).
- High beam are generally higher wattage, so will have a lower resistance between it's pin and ground.
- Low beam is lower wattage and will have a higher resistance between it and ground
Just for the record (in case someone wants to know this later. After thinking about this, my comments on the tests to perform were wrong anyway.
Because of the common earth, the high and low beams WILL have continuity between them, but they will have the highest reading across them, because it will be measuring across both filaments in series, which will add both resistances together.
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