Saturday, Apr 17, 2010 at 14:48
THIS IS THE ONLY (ALMOST) CORRECT ANSWER !!
You ALSO disconnect the battery minus from the chassis on ALL batteries.
And then you remove all the rust and paint from your clamp connection point
as close as suitable from the weld point to ensure THE BEST connection you can achieve. Because:
unlike popular opinion even when battery is disconnected you can have stray currents as mentioned around a longer route back to the weld point and that is potentially harmful because these are HIGH currents and even with DC welding you may get inductive spikes in board electronics because the flow across a chassis is NOT constant and can create EMFs where you don't want it.
When you ran HF/VHF/UHF radios you make sure your antennas have perfect ground. For most applications the power is low (5-20W) and RF interference
is much less like than with higher power.
When you run the legal 400W for ham radio in the car you want to earth your equipment as solid as possible as
well as earth strips to the bonnet and all other parts with less than perfect earth to short the stray RF as good as you
can to avoid inductive damage or interference with others.
good luck
gmd
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