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Car will not turn over


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I have a 74tii. It was running fine, but now will not start. The solenoid does not click, trying to engage. Battery is fine. The drivers seat belt was just replaced with an after market, non bmw seatbelt (no electrical to it). I did not remove the seatbelt buckle to the drivers side that was original. Because this belt never worked I never used it and the car would start. There is a constant voltage (12 volts) to the starter solenoid. 


Is there a seatbelt interlock on this car? It seems odd that it would start without using the seatbelt, and now even though the latch to the seatbelt  and the attached wires have not been removed from the car (they are sitting on the back floor of the car at this point). Is there some other interlock?




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Sounds like when you replaced the seat belt, the stock interlock circuit wasn't completed.


Too many edits trying to add the stupid interlock diagram from the USA owner's manual supplement.  What the heck is going on with posting pics...

http://i306.photobucket.com/albums/nn251/jgerock/original seat belts/620d38bf.jpg





Edited by jgerock

Jim Gerock

Ruby Red 73tii built 5/30/73 "Celeste"

Riviera 69 2002 built 5/30/69 "Oscar"

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I took my noes seat belts off and the old ones on. Car starts, without the belt being fastened. I don't have stock seats and the load sensor seems to be not connected. Does the post that goes into the side of the car on the tensioner ground the system?


is there a way to use the new belts and bypass all this interlock stuff?

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Yes, there is a write up on the board,search 74 seat belt interlock bypass, at this age the relay is prone to fail whether it's bypassed or not, when you bypass it or unplug it it just thinks no one is occupying the seat and it lets the car start  so just delete it and throw it in the neighbors pool.

If everybody in the room is thinking the same thing, then someone is not thinking.


George S Patton 

Planning the Normandy Break out 1944

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