Re: ignition wire burnt
According to '68 wire diagrams, brn/wht is GEN light circuit.
OE ign power wire is cloth covered resistive wire, maybe 1.3 ohms, I think.
Now with ign swapout to LS, it will need full power.
It may need to be from an added relay and relay powered by IGN power from switch.
As I believe, '68 ign switches have ign power from switch in START position, then once engine starts, key is released and power is from the normal IGN position.
Like I suggested, you may need to wire this OE power, from IGN spade on fuse panel, to power relay for ign power.
As far as 8 to 9 volts when cranking, battery needs externally charged and/or a bigger capacity battery for more power.
Probably the reason for momentary power, from existing ign switch, may be due to carboned/burnt contacts inside switch.
How many times has it been turned between the two positions in its life?
Every time the contacts got close to each other, both positions going into and out of IGN, a spark is generated and this action burns the contacts.
Over time, this carbon builds up.
I have taken apart ign switch and emery papered the contacts and reassembled the switch, but I would not advise it, a lot of springs and loose parts come about.
Disassemble in a cake pan catching all parts falling.
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