Volvo Owners Club Forum - View Single Post - 1800:

grahamwatson · Dec 29th, 2021, 23:41

Am I understanding the (72) 1800ES wiring diagram correctly in concluding that the reversing (back up) lights relay in manual cars was repurposed as a seat belt warning relay in BW35 automatics?

If so, the seatbelt warning light on manual cars operates without a relay, but is apparently wired through a gearbox "contact". What would that be? On the M41 which I am installing there is the fourth gear switch and solenoid for the overdrive, and the switch for the reversing light, but nothing else apparently electrical. Am I missing something?

Dec 29th, 2021, 23:41	#1
grahamwatson Member Last Online: Aug 8th, 2023 18:40 Join Date: Oct 2015 Location: Inverness	1800ES wiring Am I understanding the (72) 1800ES wiring diagram correctly in concluding that the reversing (back up) lights relay in manual cars was repurposed as a seat belt warning relay in BW35 automatics? If so, the seatbelt warning light on manual cars operates without a relay, but is apparently wired through a gearbox "contact". What would that be? On the M41 which I am installing there is the fourth gear switch and solenoid for the overdrive, and the switch for the reversing light, but nothing else apparently electrical. Am I missing something?