Quote:
Originally Posted by kvjb
Thanks for the input. It's a generic 8 fuse hotrod harness and the instructions say to wire it to battery +. The way I understand it, the battery, starter and alternator are connected on the same circuit so it shouldn't really matter at what point you draw power from. I'm just wondering if my understanding is flawed.
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The thing to remember is that the alternator is the main power source and the battery is the back up. It's amazing how many people, even professionals think just the opposite.
You are correct in thinking that the alternator and battery leads are connected on the same circuit, but you can't just wire the alternator directly to the battery and then run the battery power to the fuse panel. Unless you used a large wire from the battery to the fuse panel and you'd have to use a large fusible link. It doesn't require a very large wire to charge the battery and it wasn't designed to run the electrics on the truck for very long.
A much better way to do it is to run the alternator to the starter terminal with a fusible link on the alternator wire if you want to, The factory does on the 74 and up vehicles. Then you can run a 6 gauge wire from there to the main harness junction, probably the fuse panel, and feed all the circuits off of that.
You won't need to run a wire back to the battery since the alternator will charge it through the positive cable and the battery can feed the truck circuits through the same cable. Pretty simple and easy to do.
You will still have to run the wiring from the circuit switches to the loads and the alternator wiring, but that should be included in the harness you bought.
This is how the factory did the wiring, and they used the alternator output as the main power source to the main junction and then ran a wire from the battery to the same main junction.
The main junction on these was just a four wire soldered junction and one wire carried all the current from there to the fuse panel and the ignition and headlight switches. It wouldn't work too well on today's multi-circuit vehicles.