Maybe we are dealing with a W115 thing here. In my early 123 GP converted system, the jumper wires merge and go to a 80 amp strip fuse (was 50) on the fire wall then to the solenoid, There was no separate relay just the timer under the dash which is now out of the loop completely.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"