m20 into prefacelift m10 wiring again

[mrrodney]

right people , i got a 85 auto 318 , ive bolted in a 325 with auto from a prefacelift 325 with the round engine plug

mine has the square/rectangle plug so ive looked up the diagrams for loom plugs etc , ive fitted the square plug to the 325 engine loom ,

its worked out colour to colour apart from 1 wire from the car loom side ,(brown with purple trace) that isnt connected, and theres a few on the engine loom that aint connected but i presumethey are for check lights etc ,

i havent put the box loom in yet but i got it turning over , but its not firing and the fuel pump isnt priming ,

ive lived the relay for the pump but isnt starting yet, other than no box loom is there something i missed with wiring in the engine plug?

anyone got a better diagram than in the wiki? as that hasnt really helped me lol,.

[Brianmoooore]

The ONLY wire that needs to be connected in any E30 engine loom plug for the engine to run is the plain green ignition switched live. The green/purple wire feeds power back put of the engine loom for the fuel pump, but there are other ways of feeding this, and a 12 volt feed of short duration is also required to the black/yellow wire to trigger the starter motor.
Apart from the main loom plug, whether it's rectangular or round, there are two other wires that must be connected - the two that go to battery positive and negative.

[mrrodney]

battery terminals connected , hence it turning over ;) lol ,

how does the engine loom earth? as i havent seen any earths on the loom that i remember apart from,

im hoping that somethings just come unplugged while fitting the engine in as i fitted it with loom still attatched,.

[Brianmoooore]

Engine loom earth = battery negative = stud on top of RH suspension turret, although IIRC some ancient stuff has some brown earth wires bolted to the inlet manifold.

[mrrodney]

ill have a propper look tomoz,.