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Q & A: 1971 MGB Electrical Problem

John,

Thank you for your earlier assistance in determining that my intermittent
hesitancy and tach swing was the result of a loose ground connection to
my
starter solenoid.

A few weeks ago, I brought my 1971 B into a local body shop for some
repaint
work. Misc. scratches, nicks, etc. When I got it back, I noticed an
oddity... when driving with the lights off, it was running about 1000 rpm
on
idle, when I turned the lights on (either parking or beams) it dropped
down
to 800 rpm. At speed, the 200 rpm difference also occurred. I checked the
connections which the body shop had cut and reconnected to all the parking
lights and resoldered them. No change. This problem does not occur with
the
radio or heater fans on... cause? corrective measure to take?

Also,possibly related, when driving back from an away event, I decided to
keep up with a Porche 914 and was running 90 mph area on an open stretch
of
the Interstate for about 15 minutes. When I slowed to exit, flipped my
lights on to say "farewell", shifted to neutral and the car stalled! I
was
able to restart easily by turning the key. This issue continued all the
way
home whenever I shifted to neutral prior to stopping. When I returned
home,
I increased the slow idle back to 1000 rpms and the problem has not
repeated
itself... cause? comment?

Thank you in advance for your assistance!

Best regards,

Bart & Audrey Savino

Bart!

I've read your letter twice and cannot determine if, in fact, the
engine changes speed. I suspect it is not changing speed, it's just the
tachometer which changes the indicated rpm. If this is t... read more