Suddenly today my lights and all Accessories Stopped working while the engine is not running, but all work fine once it starts up.
Hope this isn't a stupid question that results in replacing a fuse somewhere.
but it just seemed weird to me that all works fine while running.

Any ideas before I start ripping into wiring?

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Franklyn
1965 Dart GT - 1949 Plymouth Special Deluxe

Interesting problem. Sounds like you've got an open circuit somewhere in the A1/A1-A main line running from the alternator to the battery, allowing all the accessories to operate only off the alternator and not off the battery. But the engine will obviously start, which is odd given the other symptoms. Does your ammeter work correctly; does the needle swing in both directions in accord with the electrical load and the engine speed?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

hmmm, it is interesting and too dark outside to go poking around unfortunately.

You're on to something though Dan. reason being is that I have recently replaced the A1A wire that goes from starter relay to ignition switch. (or so I thought)
But in closer inspection of the diagram, i think i may have made a vital mistake by way of assumption.

My car wouldn't start the other day, yet I could fire it up with the screwdriver trick, (this has happened a number of times since purchasing it last year) eventually I decided that the corroded connections at the bulkhead were the culprit, cleaned them a few times and worked for a while each time but failed again. so replaced the wire the other day with some 10 gauge RED to where an inline fusible link attaches to starter replay.

I was working off of a basic, working and logical wiring sense, (yet quite novice) and figured the ignition switch "ST" post would go directly to the starter relay. to engage the starter.
Seems like i am wrong here... Though solved the not starting issue

time to retrace my steps, where does this wire lead to exactly when traveling back from the bulkhead. I am thinking I will need to pull out the instrument panel?

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Franklyn
1965 Dart GT - 1949 Plymouth Special Deluxe

I forget, is yours a Canadian Dart-shaped Valiant or a US Dart-shaped Dart? The starting and charging systems are wired up a little differently between the two. Do you have a wiring diagram specific to your car or are you going off a generic or multiple-year diagram? I don't know that you'll necessarily have to pull the IP, but I think you're on the right track looking first and hardest at the wiring you most recently reworked.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Mine is a US Dart shaped Dart.

The "GT" model if that makes any difference.

I have Detroit Iron's DVD manual for 1965 darts (i think this would be the accurate FSM) But maybe the GT status has some differences?

More likely though, my mistake is that I've overlooked the routing of the wiring and just determined which post on the ignition switch will fire the starter and put two and two together. (made total sense in the moment)
Though I'm realizing now it was a "tunnel vision" moment. where I took what turned out to be a "sortof-effective" shortcut to get it starting.

Its a good thing I'm a mellow dude, or I might be getting at myself for this one

I'll keep plugging away tomorrow, and spend some time studying the diagram, focusing on the routing of wires rather than just names of terminals.

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Franklyn
1965 Dart GT - 1949 Plymouth Special Deluxe

GT is a trim level -- all '65 Dart mechanicals and electricals are alike regardless of trim level.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Got it figured out.
Thanks Dan, your words caused me to slow down and study the diagram a bit.
I had connected the starter relay directly to the ignition switch, bypassing a whole ciruit.
I think my alternator will thank me.

Another strange little ghost due to this though... I was dilligent with disonnecting the battery whilst working on the wiring of course, but somewhere along the line, the underdash maplight, and both interior lights burnt out simulteaneously.

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Franklyn
1965 Dart GT - 1949 Plymouth Special Deluxe

Weird about the bulbs, but sounds like you're well on your way.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

I have seen multiple bulb failures, if the alternator output voltage goes too high. This might have happened, due to a wiring problem.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225