Originally Posted by
JFB Tech
Martin, it's correct that only the auto cars have the inhibitor SWITCH but manual DOHC cars from 1990 on have the same relay XII but it is fed from the EEC IV ECU instead of the inhibitor switch. I know earlier cars had a jumper in the fuse box and no relay.
Both of my 1992 manual cars have this relay, the estate is DOHC and the 2.9 twin turbo used to be DOHC.
The wiring diagrams in the Haynes book show the relay for auto or a jumper for manual and label the relay as Auto Trans Relay XII.
I'm not 100% on the position in the fusebox but relay XII is identified on the diagram in the fusebox lid.
That makes sense now
OP, so you think the donor car was originally an automatic, if so you probably bypassed the switch when it was converted, something you haven't replicated when moving the loom over, perhaps?
Martin