As long as the battery, alternator, starter, and fuse box B+ feeds are all connected to each other somewhere, not necessarily in the same place, you're good to go.
In mine, I still have the terminal post thingy that sits in the engine bay right in front of the ECU compartment. I think some people call it the jump post. I just ran a separate heavy gauge B+ wire for each of the three (starter, alternator, fuse box) to that and connected them to the same post.
The line from the battery to the jump post has two conductors. One big one with the B+ for the starter. Another smaller one, maybe 14 gauge, that connects to a lower terminal on the jump post. That has a fuseable link inline somewhere, back by the battery I think, and it feeds B+ power to the ECU.
By mistake I connected the fuse box B+ to that lower terminal for the ECU feed. Then the car pulled so much current through the 14 gauge wire that the fuseable link did its job and de-linked. Took a while to figure out that one. When I hooked things up, I assumed all the different terminal posts on the jump post box were connected on one buss, but apparently that little one for the ECU feed is separate. BMW probably uses the battery to buffer the ECU voltage? Makes no difference to me because my BMW ECU is ancient history anyway.
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As long as the battery, alternator, starter, and fuse box B+ feeds are all connected to each other somewhere, not necessarily in the same place, you're good to go.
In mine, I still have the terminal post thingy that sits in the engine bay right in front of the ECU compartment. I think some people call it the jump post. I just ran a separate heavy gauge B+ wire for each of the three (starter, alternator, fuse box) to that and connected them to the same post.
The line from the battery to the jump post has two conductors. One big one with the B+ for the starter. Another smaller one, maybe 14 gauge, that connects to a lower terminal on the jump post. That has a fuseable link inline somewhere, back by the battery I think, and it feeds B+ power to the ECU.
By mistake I connected the fuse box B+ to that lower terminal for the ECU feed. Then the car pulled so much current through the 14 gauge wire that the fuseable link did its job and de-linked. Took a while to figure out that one. When I hooked things up, I assumed all the different terminal posts on the jump post box were connected on one buss, but apparently that little one for the ECU feed is separate.
If God meant for man to motor-swap LS engines into track cars, He wouldn't have created Corvettes.
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