I have an issue with phantom voltage occurring at my headlight connectors on a 1924 stock setup. With the connectors disconnected from the headlight bucket, I read 6.3V on one wire (normal) and simultaneously 2.0V on the other (abnormal) on each of the left and right connectors. The voltage alternates between the wires when the headlight switch is moved from the DIM to ON positions. Both the right and left light connectors exhibit the same voltage readings and behavior.
Perhaps the issue is in the main headlight switch? I hate to have to tear apart that switch!
Anyone else have a similar problem or suggestion?
Disconnect the wire from the switch and test, maby the leakage is through the cloth insulation.
I helped a guy with a similar problem last year.
He had a Bright/Dim correct dual bulb on one side and a single element magneto bulb on the other side.
One bulb was rather dim and very confusing to him.
Changing that magneto bulb made everything right.
Like Ron Said.........Bad Ground...
It is probably normal. You are trying to measure low voltage with a digital meter. You will come up with goofy stuff that doesn't make sense.
You should troubleshoot 6V power and ground problems using a light bulb to eliminate false readings.
Question: Is there any problem when the wires are connected as Ford wiring diagrams show?
Royce was partially right; but I was using an analog meter. After testing and tracing all headlight & tail light wires, it turned out that they were not wired as per Ford diagram. I determined when each of the wires was hot (Dim, Bright & tail) when they should be as per the dash switch position. After that there was no voltage bleed between the two contacts at the headlight buckets.
Additional question: On the headlight thimble connectors, is the TOP position for DIM (and the BOTTOM position for BRIGHT)?
The bulb does not have staggered pins so after the bulb is installed correctly with the offset filament to the top(dim) you see which wire lights it up when the switch is set to dim. Yes to your question.