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Re: [Mgs] Driving, one bump, no power ....

To: "Paul Root" <ptrmgb@gmail.com>, "MG List" <mgs@autox.team.net>
Subject: Re: [Mgs] Driving, one bump, no power ....
From: "Paul Hunt" <paul.hunt1@blueyonder.co.uk>
Date: Sun, 23 Sep 2007 14:52:22 +0100
If it *was* the battery that jumped up and shorted out on the cover then 
unless it welded itself there the interruption would have been momentary and 
the engine would have restarted while still being spun by the forward motion 
of the car, as you don't seem to have dipped the clutch for a few moments. 
The alternator shouldn't have been damaged by a short on the output, they 
are internally protected against over-current, but who knows what spikes 
might have been generated by shorting the battery (if that is indeed what 
happened, any tell-tale weld marks on the connector or cover?) as they 
should be disconnected when welding.  If the engine didn't restart while it 
was still being spun, nor was there any power (warning light on?) when you 
turned the key to crank, that implies a failure of a brown connector at the 
solenoid, but they should be on studs on a 77 and very unlikely to respond 
to a bump.

If the clock is still off that implies a problem in the purple circuit and 
should be easy to find.  If the courtesy lights and horn are OK then it 
isn't the fuse so probably just the 12v or ground wire to the clock dropped 
off.

For the radio it depends where it is powered from - normally it would be 
from the accessories position of the switch, is normally the only thing that 
is, and should have its own in-line fuse.  Again it looks like a 'one-off' 
unless it shares the ground with the clock.

If the car starts and runs but the ignition warning light is on that implies 
no charge from the alt, again easy to check at the plug on the alt.

With some power having come back it looks like the original cause of loss of 
power to the engine has been lost ... until you hit that bump again.

PaulH.


----- Original Message ----- 
> So I'm driving into work to replace the dns/proxy server.   And I change
> lanes for my exit, and hit a bump.
> Radio goes off, no power, push in the clutch, and the engine dies. Hit
> the starter, nothing.
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