Posts: 2754
Location: Mauston, Wisconsin | No, I was answering his question, not your's. I didn't say he should hook it direct without a fuse! " No! Hook it direct as long as it has an inline fuse to protect the wires" . I stand by what I said about tapping into another circuit. Why? Because, I have yet to meet an electrical engineer or a psuedo electrical engineer that could prove Gustav Kirchhoff wrong! I still do this for a living and have been doing so for ~ 40 years.
http://en.wikipedia.org/wiki/Gustav_Kirchhoff
The problem peculiar to tapping into an existing electrical circuit is that there is already a current flow and a corresponding voltage drop associated with the existing load in the loop impedance, i.e., because of the total circuit impedance.
F. ex. the battery may be at 12.7VDC. Yet at the point of the tap it could be much lower, or even a pulsing DC. This all depends on the physics of the circuit and the other load's/loads time-current characteristics. It's probably why he's having a problem now! Then guy's wonder why they get interference in their high tech equipment? Go figure! Believe me- cascaded circuits, i.e., what you are advocating don't work well with powering modern electronic equipment. That is equally true of either AC or DC circuits.
Al
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