Question about 1994 BMW 7 Series

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1994 BMW 740iA electrical fire under hood. Cannot find proper electrical wiring diagram. Wiring is burned from 8 wire 12 pin connector and is melted into the main wire trunk that travels along the left side of the engine compartment. Does anyone know what may have caused this, where to find the proper wiring diagram (that's fairly easy to understand), what the correct terminology of the wiring trunk and connector are to find one to replace it?

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  • wolferzz Aug 01, 2009

    Unfortunately, the power distribution and wiring on my 1994 BMW 740i A is on the left side, immediately forward of the firewall. It is unclear as to what caused the fire, but I suspect it was just age and normal friction from driving. The wires are melted together and the vehicle has no abs, no traction control, no brake lights, and essentially runs in "emergency mode". I've been saving up to get it repaired, but according to BMW the harness itself is $1700+ and their labor to install is over $3000. I'm really hoping to be able to find the diagram and somewhere to find the complete replacement wiring set. Otherwise I fear I may have to just sell it and find another one to purchase. I only paid $8000 for the car, and it is in near mint condition aside from this major problem now. I am not looking forward to spending over $5000 to get it perfect again.



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Check out this link. It is to RealOEM and will provide you the BMW product codes and descriptions you need to find the replacement harness,

Also, the link below is to provide you schematics for your engine wiring harnesses. You did not indicate which engine you had (diesel or gas). The link provides access to schematics for both engines. From the main menu, select: Drive, then your engine and then select engine electrical system. As far as the cause, you didn't mention what the source of the fire was. Check online for recall notices for your specific model. A google search will yield several links to sites that list recalls for yyour vehicle. It will let you know if there are any known issues regarding engine compartment fires for your model....

Posted on Jul 07, 2009


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Posted on Jan 02, 2017


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