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In the 700/900 FAQ there is mention of a problem where the engine dies when the headlights are turned on.
Bad ground in the left front fender.
That area contains the power stage and a thing that looks like a 4-part ballast resistor. Clean up the grounds on both of these and clean their connectors and put dielectric grease in them. Techs often zip tie the connectors together as well.
In my '90 there is a large ground cable attached to one of the mounting bolts of the ABS, you should look at the ABS connections as well if you have ABS.
With our 744 Ti , the car stalled when the high beams were selected, cleaning the grounds cured the problem.
It would a good idea to clean and grease all the connectors in the engine compartment, and zip tie them where you can. Look at all the pins in each connector to make sure that they have not slipped out of place. In many cases, there is a tang that holds them in place. BTW, my brick has two ground straps that run from the valve cover to the firewall.
I have definately found that bad connections pop up if your brick is allowed to sit for some time.
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'96 855R, '95 855, 854, '90 744 TI, 366,000 miles put on 7 bricks
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