I think this matches what I am seeing.
The relay itself is fried and the connection for one of the 12v spades
is fried. That spade is toasted all the way up into the relay.
It will actually wiggle around now inside the relay.
Here are some links to the relay.
Here are two bad pictures of the relay: (one blurry, the other with a
flash glare...)
http://www.lundgren.us/78/P20May2013Mon_2026-09.jpg
http://www.lundgren.us/78/P22May2013Wed_0841-30.jpg
And the wires on the bottom:
http://www.lundgren.us/78/P22May2013Wed_0841-40.jpg
http://www.lundgren.us/78/P22May2013Wed_0841-48.jpg
http://www.lundgren.us/78/P22May2013Wed_0842-07.jpg
<http://www.lundgren.us/78/P22May2013Wed_0842-01.jpg>
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.
--
Andrew
On 05/21/2013 05:16 AM, PaulHunt73 wrote:
> Yes it's a bad connection, but highly unlikely to be a bad ground.
>
> Any bad connection reduces the amount of current that can flow, and in
> the process a voltage is developed across the bad connection, and
> hence heat is developed where heat would not normally exist. That
> heat can cause damage, but it would have to be in a high-current
> circuit to do so. The only earth connection in the vicinity of the
> relay is for its winding, which only takes a very small current, so
> any bad connection in the winding circuit is only likely to affect
> whether the relay operates or not, not cause heat damage.
>
> The bad connection is likely to be in the fan circuit, i.e. the 12v
> supply spade at the relay, the relay contact itself, or the relay
> spade that then supplies the fan motor. If it is the insulation board
> that carries the spade that shows heat damage then almost certainly it
> is the relay contact that has gone high-resistance, I've replaced one
> myself (on a UK V8) for that reason. The relay needs to be replaced,
> but you should check the condition of the wiring to the relay spades.
> If that is showing heat damage it may have been from a bad connection
> between wiring connector and spade, in which case the spade will need
> to be replaced and maybe the wiring cut back and pieced out.
>
> But you have a non-standard setup anyway. From September 76 North
> American MGBs had twin cooling fans as standard, operated directly
> from a thermostatic switch in the header tank of the radiator and no
> relay, unlike the UK V8 which did use a relay.
>
> PaulH.
>
> ----- Original Message -----
>> I have discovered that the relay controlling the fan fried. It still
>> functions, but the wire coming out of the bottom is nearly burned off.
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