Wires throught fire wall
Absolutely not. I don't have a factory wiring diagram for a 73/4, but it's very possible there is only ONE
Not only that, but some of the circuits through the bulkhead are NOT fused in ANY way relative to the wire size. That is, the wiring will burn up before the main fuse link fries
Offhand, at least three I can think of is the "igntion run", (dark blue), the crank/ start (yellow) and the ballast bypass circuit, (brown)
Also unfused and NOT protected by a fuse link is the alternator output, which means that if a short should happen in such a way that the engine should remain running and the charging system working, there is NO protection on the main charging line.
A quick look at your FACTORY shop manual will show that
Here's an article about Mopar bulkhead connector and ammeter circuits. Scroll down the page to the simplified diagram
This article,
http://www.madelectrical.com/electricaltech/amp-gauges.shtml
Which came from here:
http://www.madelectrical.com/electrical-tech.shtml
The diagram
Notice there is ONE fuse link, which is out between your start relay "big stud" and the bulkhead. This is the "main battery feed." Notice that the BLACK main charging line comes in from the alternator, and notice the "welded splice" in the black line. This is a big welded factory harness, taped up in the main under-dash harness. IT branches off to feed the headlight switch (which has a breaker in the switch), the "hot" buss in the fuse panel, the ignition switch, and a couple of other things
NOTHING which goes to OR COMES FROM the IGN switch is fused
The IGN switch feeds:
The switched accessory buss in the fuse panel
The ignition "run" circuit (dark blue)
the yellow "crank" circuit to the start relay
the brown "bypass" circuit to the ballast resistor
NONE of these are fused
Absolutely not. I don't have a factory wiring diagram for a 73/4, but it's very possible there is only ONE
Not only that, but some of the circuits through the bulkhead are NOT fused in ANY way relative to the wire size. That is, the wiring will burn up before the main fuse link fries
Offhand, at least three I can think of is the "igntion run", (dark blue), the crank/ start (yellow) and the ballast bypass circuit, (brown)
Also unfused and NOT protected by a fuse link is the alternator output, which means that if a short should happen in such a way that the engine should remain running and the charging system working, there is NO protection on the main charging line.
A quick look at your FACTORY shop manual will show that
Here's an article about Mopar bulkhead connector and ammeter circuits. Scroll down the page to the simplified diagram
This article,
http://www.madelectrical.com/electricaltech/amp-gauges.shtml
Which came from here:
http://www.madelectrical.com/electrical-tech.shtml
The diagram
Notice there is ONE fuse link, which is out between your start relay "big stud" and the bulkhead. This is the "main battery feed." Notice that the BLACK main charging line comes in from the alternator, and notice the "welded splice" in the black line. This is a big welded factory harness, taped up in the main under-dash harness. IT branches off to feed the headlight switch (which has a breaker in the switch), the "hot" buss in the fuse panel, the ignition switch, and a couple of other things
NOTHING which goes to OR COMES FROM the IGN switch is fused
The IGN switch feeds:
The switched accessory buss in the fuse panel
The ignition "run" circuit (dark blue)
the yellow "crank" circuit to the start relay
the brown "bypass" circuit to the ballast resistor
NONE of these are fused