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Join Date: Sep 2019
Location: Milpitas, CA
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Originally Posted by NickW21
Hey Dan,

I am still struggling to make sure I set this all up properly. There was one response where you mentioned: "I connected the MSD B+ to battery terminal on the starter (thank you Al for the idea) and I connected MSD B- to the chassis ground connection that the thick copper webbed cable from the transmission uses (near / beneath the starter)."

When I looked at the picture from an earlier post, it seemed like the wires would not be long enough to reach the starter from the MSD (since they only reach the midpoint of the engine near the hood latch). Did you connect to the Alternator instead or is it just some optical illusion that makes it look like the wires are shorter than they really are?

Thanks again for all your support. Hoping I can make some real progress in the next week or so. I think I finally have all parts in place to do much of the install now!!

Best,
Nick

Hi Nick,

I used some spare red and black wire to make wire extensions. I used 10 gauge because I had some on hand but the high current wires are 12 gauge so you can use that. I cut the wires from the MSD box to about 12 inches and crimped on wiring connectors (I used bullet sytle, but I know you want to use a moisture resistant connector) to connect each high current wire from the MSD box to its extension wire. Then I made the extension wires long enough to run along the back of the engine bay out of sight and drop down to connect to battery terminal on the starter (red) and engine/trans chassis ground lug (black). Hope this makes sense.
Dan

Hey Nick,
See the close up photos below.


The yellow arrow points to the wires coming out of the MSD Street Fire CDI box. The red wire is the MSD logic power wire. The larger gauge B+ (red) and B- (black) wires are under these wires and are hard to see in this photo.



Extra close up of wiring in left front corner of the engine bay:


The black arrow is pointing to the yellow bullet connector and red 10 awg MSD B+ wire extension. Just out of sight below the B+ extension wire is the yellow bullet connector and black 10 awg MSD B- wire extension. The other end of each B+/B- extension wire has a ring connector crimped to it and is connected to the battery terminal of the starter (B+/red) and the engine / trans chassis ground lug (B-/black).

The red arrow is pointing to the red 10 awg wire that supplies 12V switched power to the EFI power panel (back near the fan shroud it is connected to the black engine harness wire that originally powered the blower motor). The smaller red wire that is taped to the 10 awg red wire is the MSD logic power wire.
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Dan
1975 911 Carrera

"CIS to ITB EFI conversion" thread
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