I have a 12V electrical device connected with a positive and negative (ground) wire. It is not live. Let's say I connect a second positive cable to the first one. When I turn on the power on the first positive cablee, the device runs fine. What happens if I then also turn on power on the second positive cable? Thanks.
NOTHING IS CHANGED ! DEVICE MAINTAINS RUNNING AT THE SAME SPEED.
Thanks for answering my question, busterwasmycat. Yes, the power source is the same for both wires so I guess nothing happens when they're both on. Let me fill you in on my idea to see if you want offer any additional advice. I currently have a dash cam hardwired so that it only turns on with the car. This is fine for most cases, but there are times when I'd like to turn it on discretely after I've parked it. So I'm thinking of hooking it up with a second wire connected to a remote controlled relay that's always live. My concern was, what would happen if I forget to turn off the relay and then turn on the car? Lucky for me, nothing. Thanks!
not enough info. It isn't clear where that second wire is connected. if same source as the first, you really haven't done anything. If it is a different source, how is its return circuit completed? If you wiring is parallel, and both sources are identical but separate, then you basically double the maximum current but do not change the voltage. If you wire in circuit somehow, then you could double the voltage but do nothing to current. Basically, if you wire in a second power source, you increase the power available, and it is a question of whether that power comes from a voltage or current increase.
