Quote:
Originally Posted by jbg
[*]The engine harness has several wires lacking insulation
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All too common (Volvo used Bosch biodegradable wiring in these years) and high probability this is the source of your parasitic electrical drain. On our own '84 760 it was the cause of GP malfunctioning (on when it wasn't supposed to be, other times would not energize when required), starting issues (IP fuel cutoff solenoid intermittent wiring), shorts/opens with the altitude compensator wiring, also problems at the fusebox.
Your replacement wiring loom should remedy.
Quote:
Originally Posted by jbg
[*]Remove the master cylinder and free the stuck plunger; perhaps bench bleed it
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Might just be a futile effort; plan on replacement and full system flush. As v8volvo mentioned above, be ready to replace calipers as needed.
Avoid depressing the plunger past its normal travel range, you'll kill the MC further by forcing the piston seals into the rough section of cylinder bore.
I know it's tempting to drive it away, esp. since it started so easily.
What is the TB history? How old and when last changed?