When you say 'the engine surged' do you mean you got a surge or power and
hence accelleration? Or did the revs rise as if you had dipped the clutch?
Or what? Can't think how anything electrical would cause a significant
engine power/revs surge. If you had been running with no advance and that
suddenly came in you would notice it but hardly as a surge. Did the lights
etc only fail when the surge finished or at the start? Did the lights get
noticeably brighter at any time or not?
You should have four equally rated fuses in the 4-way block of a 72 - which
two (bottom two? Top two?) blew? The fuses can blow either because of a
short on the load, or a massive over-voltage on the supply. Two blown two
fuses implies the latter, which would have been accompanied by a significant
brightening of any lights. The head lights don't go through any fuses, only
the 'side' or 'parking' lights - one per side (the top two). The turn
signals and instruments all go through the 2nd fuse up (white to green).
The tach comes off the green circuit same as the turn signals, the fuel and
temp gauges do go though the voltage stabiliser, which is usually on the
drivers side and has a green wire on one side and a light-green/green on the
other. There is a 4-way connector behind the dash with one of the wires
feeding both tach and stabiliser, another wire feeds the turn signals.
Chances are there is a problem in the green from the 4-way to the tach (and
thence to the stabiliser).
PaulH.
----- Original Message -----
From: H. W. (Sandy) McCullough <smccullough@quixnet.net>
To: <mgs@autox.team.net>
Sent: Monday, December 18, 2000 7:26 PM
Subject: Electrical Gremlin
> I think I must have a gremlin! (His name is Lucas). I have never seen or
> heard of a problem like this, so I'm hoping someone has.
>
> Was cruising down a local hiway in my 72 B at 65 MPH when the engine
surged
> for about 5 seconds. When the surge was over, I had lost lights, turn
> signals, tach, fuel gage, temp gage, and had blown the two largest fuses
in
> the box. The car kept running and I finished my short trip. I replaced
the
> fuses and the lights and turn signals work, but still no tach, fuel or
temp
> gage.
>
> Any ideas?
>
> Thanks for the help.
>
> H. W. "Sandy" McCullough
> 72 and 68 B roadsters.
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