Small addition to your post. The fan in the North American cars I've seen is
protected by a circuit breaker instead of the fuse shown in the wiring
diagrams. This being the case, the breaker could reset itself after tripping
any number of times, possibly eventually damaging the wiring, relay, or
whatever. Of course as you have pointed out, the relay is a non-factory
component, and we do not know how it is wired into the system. If the relay
was installed taking its power directly from the Brown/White wire, it
wouldn't be protected by any fuses and resultant damage could be caused by
any number of issues. Note the factory wiring diagram, 1977 Supplementary
wiring diagram-thermostatically controlled radiator fan (p. Na12 - factory
manual).
Michael Singleton
Sportscars Ltd
10170 Croydon Way
Suite M
Sacramento, CA 95826
(916)366-0330
mike@SportscarsLimited.net
-----Original Message-----
From: mgs-bounces@autox.team.net [mailto:mgs-bounces@autox.team.net] On
Behalf Of PaulHunt73
Sent: Thursday, May 23, 2013 12:48 AM
To: Andrew Lundgren; mgs@autox.team.net
Subject: Re: [Mgs] Fan Relay fried...
I'd suspect the problem has happened before but only the heat damaged wire
was pieced out, the real cause of the problem i.e. the relay was left behind
to damage the new wire. You need to do both, changing just the relay now
may result in a reoccurrence if the wire connector is heat damaged and makes
a bad connection to the new relay spade. Unless the motor or its wiring has
a partial short and is drawing too much current I doubt both were replaced
last time. And originally the fan was fused, so a partial short should have
revealed itself ... unless that has been bypassed because it did keep
blowing because of a partial short! You need to check that fuse as well,
indeed that it does have one, as that relay is not standard for a 4-cylinder
MGB cooling fan.
PaulH.
----- Original Message -----
> I am concerned that the wire connected to the fried spade has already
> been replaced once... It is either the initial connection, or this
> has fried a relay before.
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