Quote:
Originally Posted by MikeB
I mentioned the 82 truck wiring as an example of a fuse panel fed by two 12-volt feed wires.
Just in case my eyes and ohmmeter were deceiving me, I went to a factory wiring schematic. It shows a single 12R (red, 12ga) 12-volt feed wire running from the battery, through a fusible link, to the bulkhead panel. Along the way, on the driver's side of the radiator, it connects to the alternator via the splice I mentioned earlier in this thread.
However, the 12-volt feed wire does not connect directly to the fuse panel battery bus, as I said or implied, but instead it runs through the dash harness to another splice (buried in the harness). From that splice, 12ga red wires run to the panel battery bus, the ignition switch, and the headlight switch. So yes, headlight current does not run through the fuse panel battery bus, but it does run through the single 12ga wire feeding the fuse panel, headlights, and ignition switch. So, that feed wire IS a valid place to measure current draw, including headlights, unless relays are used.
Do you have a factory schematic showing two 12-volt red feed wires used on late 60s/early 70s cars and trucks? All I can find is variations on the routing I mentioned above. The two main differences are where the horn relay was mounted, and where the 12-volts was picked up -- starter terminal, horn terminal, or splice.
Happy Motoring!
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No, that's not a valid way/place to measure
total current draw/demand.. The only place to do that is where the system main feed connects to the battery.. Everything originates there.. Measuring current at any other location could indicate "overlapping" current flow, and/or leaving some out.
Mike, what is it you're trying to accomplish? In your original post you asked about the gauge requirement on the charging circuit.. I've answered that question.. If you're wanting to debate current flow, how or where to take the readings, then, I'm sorry... I'm done here..