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1927 Buick relay

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Has anyone seen one of these before? It is on the manifold and has two relays under the box. Two of the wires from the box go down below the vacuum advance linkage. I have not seen one in any of the pictures of other 27 Buicks. 

Buick relay unit.jpg

relay wires.jpg

relay & wires.jpg

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The switch on the underside of the steering gear is you headlamp switch. The electrical box shown is probably a voltage limiter. This was a way to limit voltage before fuses and circuit breakers were used. My 29 Buick has one under the dash . All vehicle electrical current passes through it , except for starter motor draw, on my 29.

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