[weq92f]

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Recently went through voltage issues with the addition of fans to my system. Ended up using a bus bar to consolidate all the accessories power leads ( every positive cable feeding stuff like fan relays, light relays, horn relays, main fuse power panel, fuel pump relay, fuel injection, ignition box, etc... ) to a single point. Then that single point got the 6awg lead from my 140amp single wire alt and it also got the positive terminal from the battery. Then I grounded the alt with a big 6 awg cable to the frame and made sure the fans had solid ground to the frame too. So my battery has only the big lead to the starter and the big lead to the bus bar on the positive terminal and the big lead to the frame and a smaller lead to the core support on the negative terminal. I also made sure to secure the grounds from engine block to frame, cab to frame and bed to frame.

With all that, when all accessories on at idle ( fans full blast, headlights, radio, engine running, A/C on fan blowing high ) I see about 13.5 volts at the bus bar.

Hth,

-klb