 BuckSkin wrote:
...if you have a zero resistance path to Ground, you are not going to get an accurate reading of true available voltage... |
I'm afraid I did not adequately explain myself; the 'Zero resistance to ground' to which I was referring is from the Ground side of the headlight bulb all the way back to the Negative battery terminal.
In a First Approximation Theory, this is considered to be Zero Ohms; in reality, there is always some resistance, even in a brand-new vehicle. In a vintage vehicle, the actual ground path can have 'significant' (meaning enough to be noticeably detrimental) resistance.
Again, a voltage drop measurement taken from the ground terminal of the light bulb all the way back to the Negative post of the battery will tell the tale.
Installing relays to deliver maximum voltage to the headlights is an excellent way to improve lighting in vintage vehicles.
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