Maybe on the top of the starter - follow the + battery cable it will connect to the starter relay (solenoid)
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from what ive read you can switch the starter relay with the horn relay and give it a try.... if she starts and the horn dont work you have a bad relay
Locate the relay/fuse center under the hood, remove relay/fuse center cover, pull out the starter relay and replace it with a new one. It is seldom the relay is at fault.
The 1978 Mercedes-Benz 450 starter relay switch can be found on the firewall in the engine compartment. The starter relay switch will be on the drivers side of the firewall.
-A relay IS a switch, so it's un-necessary to use both terms. The starter relay in this Dodge is in the Power Control box at the top of driver side of the engine bay. A black liddded box, about 3x9 inches. Places of the fuses and relays are inside the lid. However there is also a starter solenoid attached to the starter in this model. Either one of these parts could cause failure to power the starter motor.
Usually when a starter solenoid/relay switch is bad, you will hear only a click and the starter will not spin (crank).