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I'm trying to run an accessory to my driver side battery. Both posts have plastic cleats that hold the battery connector on with a little bolt, the Negative wire has a screw post that looks like it would conduct, but no bolt on it. The Positive wire has nothing that I can connect a wire to. Does anyone have any advice on how I can solve for this. The auto parts store also scratched their head on this one, and suggested I take it to a truck shop.
You can attach the ring clamp right under the screw that tightens the battery clamp down to the post. The passenger side battery is the primary battery and preferred battery for attaching accessories to, but smaller loads would probably be fine on the secondary battery. My snow plow is connected this way.
The factory clamps are quite adequate...when tightened, they actually "cut" into the lead terminals of the battery slightly, resulting in a very good connection. Maximum current is able to be conducted through the factory terminals. Disker, your setup looks very nice though!
I might just put a ring terminal under the clamp nut.
I wasted close to two hours trying to chase down an amp error when I installed my system because of that stupid clamp & nut. It didn't help that the batteries in my volt meter leaked and ruined my volt meter so I was having trouble testing voltage. Anyway... be sure that clamp & nut are conductive. There must be some kind of coating on them. A (new) volt meter directly on that + clamp nut when the amp was on only produced 3V.
I ended up drilling a hole in the clamp & putting in a bolt like the ground side has.
My snowplow wiring is connected to that clamp nut. The harness for the plow is pretty much as thick as the main starter harness. At least on mine, no problem.