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Discussion Starter #1 (Edited)
15' from push/pull kill switch (next to battery) to firewall stud
(stud powers everything except EFI)

5' from firewall stud to starter (with solenoid)

20' from alternator to battery

Also will be powering Fast EFI system directly to battery (top post)
Any harm connecting the alternator & Fast system on that same post?
or should alternator go to battery side of kill switch?

Note:
Factory wiring fed power distribution box from battery, from there (looks to be) 4 gauge to starter & 4 gauge from starter to alternator
:smt102
 

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Discussion Starter #2
1. 15' from push/pull kill switch (next to battery) to firewall stud
(stud powers everything except EFI)

2. 5' from firewall stud to starter (with solenoid)

3. 20' from alternator to battery

Question:
Also will be powering Fast EFI system directly to battery (top post)
Any harm connecting the alternator & Fast system on that same post?
or should alternator go to battery side of kill switch?

Note:
Factory wiring fed power distribution box from battery, from there (looks to be) 4 gauge to starter & 4 gauge from starter to alternator and it worked fine
:smt102
Sorry, don't think my first post was very clear.

Looking for help to size three wires numbered above, Thank you.
 

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2 gauge on the 2 power wires. 4 gauge on the alt.

I run the alt to the kill switch not the battery

My efi is alone on it's own post.

Tim
 

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I would do 1/0 for the power wires, 2ga will give you a extra voltage drop.

Alternator to the battery gives you a cleaner power source for the rest of the car. Might still be as good going to the battery side of the kill switch, but unless there is some real reason not too, the battery is the best location. What size depends on the draw of your system. If you are NA 4ga should be fine (typically) but if you have a lot of power accessories or NOS, probably 1/0 or 1ga again for the alternator wire.
 
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