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Originally Posted by HardcoreZ28
Phil....if I had the voltage drop like in your analogy wouldn't my voltage at the lamp be lower than 11v?
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yes, but only with the lamp installed, so you need to test with the lamp in. With no lamp, there is an open int he circut and no current will flow, so the restriction will not be evident
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Voltage to ground I should be able to test. Can I remove the stock ground and just run a meter between the light housing and frame to see the voltage?
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that will work see what it shows
maybe also see if you can check from the + of the bulb, before the bulb, to ground.
ultimately its a simple system, if the bulb works elsewhere, and there is a voltage at the socket, yet the bulb does not work, there is a restriction somewhere, and unless you have 100000 miles of wire before the bulb, its going to be an issue with the controller. Im confident that if you switch wires on the controller for the 2 rear brake lights, the now unlit bulb will work and the other wont.