hi guys i got a pull Srayer off of craigs list. it is a top air, the pump that is a flow-jet has a black and a red wires coming off it i went to install a on off switch about half way up then wired off the switch to the battery, when i turn it on it works but the wires get hot to the point of melting, i have tried 3 different switches does the same. if i hook it up without the switch it works fine, but i need to turn it off, what can i put in for an off and on that will work.
how to wire sprayer
Posted April 20, 2017 - 10:33 AM
Posted April 20, 2017 - 10:42 AM
Posted April 20, 2017 - 10:50 AM
the wires coming off the pump are the same size and from the switch are bigger yet. it only gets hot from the switch to the batt.
Posted April 20, 2017 - 11:00 AM
What is the amperage rating of the switch? And how many amps does the pump pull?
- boyscout862 said thank you
Posted April 20, 2017 - 11:02 AM
Resistance causes heat. The hot spot is where the resistance is.
- MH81 and boyscout862 have said thanks
Posted April 20, 2017 - 11:07 AM
Posted April 20, 2017 - 11:15 AM
Posted April 20, 2017 - 11:20 AM
You could use an AMP meter (I suggest a regular Automotive one) as a multimeter is usually rated at 10 amps. to see what the draw is.
Posted April 20, 2017 - 11:32 AM
Posted April 20, 2017 - 12:57 PM
Sounds like it could be a bad connection at the switch from the battery. I have a trailer sprayer and put a standard 15A lamp cord in line switch in and works fine for several years.
Posted April 20, 2017 - 03:40 PM
Don't forget to consider the length of run when sizing wires. Once you know the amps you are pulling, there are plenty of charts on the interwebs that give recommended wire size in relation to amps and length of run. Here's an example...
- JBRamsey and GardnMastr have said thanks
Posted April 20, 2017 - 03:46 PM
when i hoke it up straight works fine.ill try a new relay is that hooked up before the switch.
If you use a relay, be sure you get it wired in correctly in place of the switch. Will probably have 4 wire terminals or connecting points. Without know or see which relay you decide to use, hard to tell with wire goes where. You will still use your switch to activate the relay but honestly, I don't think you need it. If the wire between the battery and the switch is the only one getting hot, like GardnMastr said, resistance is causing the heat. Bad wire connections at the switch, or a bad switch.
Posted April 20, 2017 - 04:34 PM
- chieffan said thank you
Posted April 20, 2017 - 06:22 PM
This may help somebody, sometimes I forget that people have different knowledge or background.image.jpg
That looks like a Radio Shack relay to me. Have used a bunch of them. Nice thing is they usually have the wiring diagram on the package and most are rated at 30A.
- GardnMastr said thank you