GM alternator circuit...

Guys...I'm just now hooking up a charging system using the MAD Electrical design where you use a junction block on the firewall.
The sensor wire goes to that as does the main harness wire to the fuse box and any other major loads.
The main output wire from the Alt also hooks up there.
The idea being that the Alt sensor picks up the demand closer to the fuse box (distribution point) and gives better performance as a result.

The question I have concerns the battery charging.

MAD requires that you use a 10g wire at least 7' long (prefer 10') to go from this distribution point to the battery to allow some resistance in the circuit to prevent overcharging.
Remember, ALL Alternator output goes to this junction block and with the sensor wire right there too I guess the demand on the system when lights etc are on can create quite a bit of power from that Alt...thus the need for a "buffer" for the battery charge.

7'-10' is a lot of wire to hide in a small engine compartment!

I'm thinking I might rearrange the system to sense voltage at the battery output, charge the battery directly from the Alt output and power the junction block FROM the battery terminal instead of the other way around.

YES...I could contact MAD Electrical...but that would only give me MADs viewpoint...I'd like to see some alternate thoughts or for that matter, support for what MAD Electrical came up with.

BTW...I'm absolutely NOT hammering on MAD or anything!
I've gotten some great info off that site.
Just wondering if this might be a bit overkill.

 

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If this is for the typical 73-early to 90s 3 wire internally regulated alternator I have never heard of that or seen it in a factory car. Internal regulator controls the voltage, a longer wire is going to have an almost nil increase in resistance. I run the 10g wire from the stud to the battery wherever it is mounted, no extra wire needed. 4th gen F bodies run the 10G wire to the battery and then run another 10G wire to a terminal block so you have a central 12V tap. Sounds like this is what you are trying to do?