Can someone help design a 5 volt circuit
Yes I realize this is an RV forum but the post is related to wiring on my tow vehicle. I have a diagram below of what I am trying to do. But I will spell it out as best as I can first. My hope is that...
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That lead from the ignition switch to neutral/park switch is energized ONLY when the key is at Start. This won't help for your use-case.
You'll need to pick off the Run lead, not the Start lead.
Put a small continuous duty relay on the Run lead, and wire it as follows:
Coil:
Positive: Run
Negative: Ground
Switch:
Common: 5V source
NO*: 5V sense
*NO - Normally Open (when the relay is not energized)
Now the 5V circuit is closed when in Run mode.
If you want to open the circuit when the transmission is not in park/neutral, then wire the negative coil wire to the start line between the key and the neutral safety switch, AND add a blocking diode between the coil and Run line.
Now, when the key is in Start, 12V+ will be on the coil negative line, as will be on the coil positive side from the Run line. The diode prevents 12V+ from back-feeding the run line.
Wire the diode as follows: Run -->|-- Start (in my best ascii graphics).
When in Run mode, and in parK/neutral, then the coil will pick up the ground through the neutral safety switch, and the starter solenoid.
Good luck!
You'll need to pick off the Run lead, not the Start lead.
Put a small continuous duty relay on the Run lead, and wire it as follows:
Coil:
Positive: Run
Negative: Ground
Switch:
Common: 5V source
NO*: 5V sense
*NO - Normally Open (when the relay is not energized)
Now the 5V circuit is closed when in Run mode.
If you want to open the circuit when the transmission is not in park/neutral, then wire the negative coil wire to the start line between the key and the neutral safety switch, AND add a blocking diode between the coil and Run line.
Now, when the key is in Start, 12V+ will be on the coil negative line, as will be on the coil positive side from the Run line. The diode prevents 12V+ from back-feeding the run line.
Wire the diode as follows: Run -->|-- Start (in my best ascii graphics).
When in Run mode, and in parK/neutral, then the coil will pick up the ground through the neutral safety switch, and the starter solenoid.
Good luck!
