Greetings,

>I spent some time perusing the Haynes manual this evening - noticed 
>something interesting. MK IV Spits had a relay in the O/D wiring, but 
>1500's did not.

Earlier cars with the D type O/D had a different solenoid with
"pull in" and "hold" windings.  It pulled more current and needed
the relay.

>Pros and cons?

As you mentioned:
Pros = less stress on the switch even with later J type O/D.

Cons = More parts with more wiring to go wrong.

LBC'ing U,

--
Bob Sykes (& '78 Spitfires)
[digest impaired]

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