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Alternator junk. Should be more like 13.6v running. Car is running on battery voltage until battery gets run down too far. Lights drew to much voltage and killed ignition system.

New carb before the dyno and problems started on the dyno. I would start at the carb.

On a neg ground system elec flows from neg to pos thru the systems back to ground. The elec supply is stored in the battery. It cannot flow from the battery until the ground is hooked up. When you are hooking and unhooking the positive first you are playing with a live circuit midstream. By...

Any draw can. Disconnect that hot wire and test again. By removing the ground cable at the battery first and hooking it up last eliminates arcing.

They draw a trickle for memory. One wire is hooked to a constant hot. Another to a switched hot.

You should always remove the ground cable first and hook it up last.

Had a diesel blazer (US Army) that gave me fits. Horn beeping when turn signals were on. Engine kept running with key off and headlights on- shut off lights and truck would shut off (fuel solenoid). A few other wierd things like that. It all came down to a ground wire down by the parking brake...

Sure sounds like back feeding due to poor/lack of ground. Make up some wires with alligator clips and start adding grounds from the body to battery,engine to battery, accessories to battery etc.

With the neg cable disconnected from the battery you should have no juice anywhere.

Spark when connecting the neg cable means something is drawing current. I would be looking for a dead short somewhere.

Yes mine is a factory equipped tach/cruise car. I cant tell you for sure if anything changed from 1968 (mine) to 1970 (yours) on the tach/cruise.

For only so many times until the low battery voltage causes the contacts in the clock to arc and weld themselves together.

Batt posts clean? Ground straps cleaned up?

Dimple where my vacuum hoses come thru

Easier to see upright. Tach wire at upper arrow. Cruise wires at lower arrow.

My vacuum hoses would be for the hidden headlights (Charger). You have a dimple there in your pic. I dont know if much changed from 68 to 70 but you could drill the dimple above the bulkhead and run your tach wire. Put your cruise wires where your tach wire is now. That should put the cruise...

68 Charger RT with tach and cruise. Tach wire goes thru above the bulkhead. I would have to look at the cruise wiring. The grommet posted earlier looks a lot like the one in my pic below the vacuum hoses. The tach wire is in a different location on the non-cruise cars.

Are you out of gas?

But your switch only has 2....