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Posted by Tom Petroff (IL) on Saturday, March 15, 2008 at 17:26:01 :
In Reply to: My breadboard says they need to reverse with polarity change. posted by Chris Case @ San Diego on Saturday, March 15, 2008 at 16:08:14 :
I don't have my books handy at the momment,
but it seems like the very early 46/48 trucks used a two wire sender. And it was polarity sensitive between the two wires, and bimetal strip that was heated.
Then they went to a one wire gauge w 6v and then on to 12v in late 55 or early 56.
You can not use the earliest gauge with later senders.
You need to figure out what you actually have.
TGP