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eHam Forums => Mobile Ham => Topic started by: AE5KH on February 18, 2013, 02:46:54 PM



Title: Radio 4 power wires???
Post by: AE5KH on February 18, 2013, 02:46:54 PM
Just wondering why some radios have two positive and two negative wires for the power connection? I have a IC7000 and it has two but the wire goes down to one to the battery, don't know why???


Title: RE: Radio 4 power wires???
Post by: AA4PB on February 18, 2013, 03:20:49 PM
Two parallel wires will double the current handling capability and cut the voltage drop in half. The other option is to use a larger guage wire. The primary issue is probably the current rating on the connector being used. Some radios use a 4-pin connector with two pins used for the POS power connection and two pins for the NEG connection. Sometimes they connect two pins to a single larger guage wire and sometimes they connect two smaller guage wires, one to each pin.


Title: RE: Radio 4 power wires???
Post by: K1CJS on February 18, 2013, 04:16:58 PM
As 'PB said, it's to lessen the current flow through each pin connection.  All too many molex connector pins just can't handle higher amperage without heating up--and melting.  Assembling the harness connections with two pins for positive and two pins for negative just makes sure that the connectors can handle the current flow,  stay cooler and the power connections remains trouble free.