by KE4AVB » Thu Aug 30, 2018 11:12 am
Okay then to find to source of the drop work your way back along the solenoid trigger line checking outputs and inputs of each switch. There a point you get nearly a zero reading as you back pass the bad point.
Note that on a 5 ft run of 18ga you will have a resistance .032 Ω and on a 10 ft run it is .064 Ω and voltage drop on these runs will depend on the amperage going thru the wire. Say it is a 10ft with 3 amps then it is a 0.19 volt drop across the run just from the wire alone. Every contact will also have a slight resistance too. This doesn't come in play much at DC but in RF ranges that I transmit on I can lose a 1/2 of the output per connector pair or 3 dB and I go above the HF bands it gets even worst as the coaxial cable has attenuation which varies cable design and length.
Now if your battery cable is 5 ft long and is a 8 ga cable with 80amps going through it there would be a voltage drop .24 volts as the cable resistance is .003 Ω
As you see the voltage drop can build up just depending wires and connection points are involved between the two test points.
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