Two relays are used for the siren and for starting the engine, independently of each other.

The siren has its own 24059 and is activated with a switch from the interior.

The starter itself is connected directly to battery +.
I use the 24059 only to save my ignition switch. I did not run terminal 15 (hot key, is that what it's called?) to the Ignition terminal for the starter, but run that initial voltage for the starter through the relay.

I hope that I could explain it reasonably.

Where exactly is the difference between the 24059 and the 24023?
Thank you :-)

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1970 Chevrolet C10 Stepside and 1966 Chevrolet C60 Firetruck (Germany)