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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Thanks for the replies, I really do appreciate the thoughts and I am listening. Here's what I do know.
As far the computer 5v out and in wires...
This is pre OBD2 so when pulling codes with the engine running it goes through various computer checks including automatically revving the engine up. If I forget to twist the two computer wires together the computer does not see a neutral signal and it will just sit at idle. It will not rev the engine, and will not spit out codes. When I twist the wires together it goes through the checks, revs the engine and spits out the codes. So my relay idea is to just make a fancier switch to twist the two wires together. But I was unsure of the effects of the wires inside the relay.
I do agree with jkwilson and could run a switch that just puts the two wires together whenever I want to pull codes. In fact that's exactly what I almost did last week. But then my brain started churning to see if I could make it better. I am probably going to take that safer route and just run a switch, but wanted to get some thoughts and ideas first.
For the record this is the relay I was thinking about using. This extra relay only has to power the starter solenoid through the existing 16g wire. Link
What I am hearing from all of you though is that I will probably get a voltage drop and the 5 volts might not be strong enough to trigger the relay. This is really what I wanted to hear or maybe not want to hear but what I needed to hear. I definitely need to do some more thinking on this.
I welcome any additional feedback positive or negative that you might have.
Thanks
As far the computer 5v out and in wires...
This is pre OBD2 so when pulling codes with the engine running it goes through various computer checks including automatically revving the engine up. If I forget to twist the two computer wires together the computer does not see a neutral signal and it will just sit at idle. It will not rev the engine, and will not spit out codes. When I twist the wires together it goes through the checks, revs the engine and spits out the codes. So my relay idea is to just make a fancier switch to twist the two wires together. But I was unsure of the effects of the wires inside the relay.
I do agree with jkwilson and could run a switch that just puts the two wires together whenever I want to pull codes. In fact that's exactly what I almost did last week. But then my brain started churning to see if I could make it better. I am probably going to take that safer route and just run a switch, but wanted to get some thoughts and ideas first.
For the record this is the relay I was thinking about using. This extra relay only has to power the starter solenoid through the existing 16g wire. Link
What I am hearing from all of you though is that I will probably get a voltage drop and the 5 volts might not be strong enough to trigger the relay. This is really what I wanted to hear or maybe not want to hear but what I needed to hear. I definitely need to do some more thinking on this.
I welcome any additional feedback positive or negative that you might have.
Thanks
