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Near Intersection of I-35 & I-90 Southern Mn. | All good suggestions. My first thought for the connector at the hitch was an Anderson style. But as someone mentioned they are not sealed meaning if it is just dangling out the cab window when not in use one of the terminals will be 12V. Maybe some type of protective cover is available.
A fuse of appropriate size should be installed in the tractor side for safety.
I also agree with the idea of using a continuously rated relay.
Here's a thought that should work but maybe unnecessary. This method would have the relay mounted on the tractor instead of the sprayer.
Place the relay in a convenient location on the tractor itself. Use a heavy wire from the "+" terminal of the tractor battery to a fuse to the Common terminal of the relay. Run a heavy wire from the Relay output (Normally Open) to the "+" pin in an Anderson Connector. Run a heavy wire from the "-" terminal of the tractor battery to the "-" terminal of the Anderson connector.
Wire one of the coil terminals on the relay to the tractor "-" terminal (Ground). Now all that is left is to provide a trigger for the relay.
My thought is to run a light duty (only needs to trigger the relay) from a 12V source on the tractor through a fuse to a common switch. The output from the switch would go to one of the pins in a two pole connector beside the Andrson connector. Another wire would run from the remaining terminal on the relay coil to the other pin in that two pole connector. A mating two pole connector would use wires to run to another switch on the sprayer.
With this arrangement the two switches would be wired in series. Both switches would need to be ON for the rinse device to run.
This means that for normal spraying, the switch in the tractor could be left ON. The operator would use the switch on the sprayer as needed. This may seem overly complicated but would have the advantage that the operator could "kill" the power from the tractor if not needed. The Anderson connecter could be used as a power source for some other device. A jumper/dust plug could be used in the two pole light duty connector where the two pins are just connected together. The connector would be protected from the elements and the tractor switch would be in complete control. If the Anderson connector is never going to be used for anything else, a blank dust cover would be fine.
I was thinking of using an Anderson connector for the high current connector and most any two pin connector (Weather Pack etc.) for the relay trigger.
Another approach would be to use a hot pin and ground from the 7 pin connector on the tractor. Then at the sprayer use a Heavy Duty switch or a relay. The advantage would be that the 7 pin connector may already be present and has its own dust cover. According to the chart below Pin 7 would be the best choice. Be certain to use a good quality 7 pin plug for the sprayer side. I have had to replace a few of them due to a poor ground after a while. I strongly encourage using ferrules on the wires you attach to the 7 pin plug. These are metal bands that can be squeezed over the wires. This keeps all the strands together and will allow the set screw in the 7 pin plug to make good contact with the wires. I purchased a kit with a pliers and assorted sizes of ferrules online. These ferrules are useful in many situations involving stranded wires. Here's one source:
https://www.aliexpress.us/item/3256802860733914.html?src=bing&aff_sh...
Edited by tedbear 3/13/2025 10:30
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 Wiring (full).JPG (53KB - 11 downloads)
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- RE: Which relay, switch, connectors, etc to connect pull-type sprayer to tractor power - tjdno1 : 3/13/2025 03:42
- RE: Which relay, switch, connectors, etc to connect pull-type sprayer to tractor power - Kelly : 3/13/2025 06:36
- RE: Which relay, switch, connectors, etc to connect pull-type sprayer to tractor power - Lone Cedar : 3/13/2025 06:56
- RE: Which relay, switch, connectors, etc to connect pull-type sprayer to tractor power - WildBuckwheat : 3/13/2025 07:45
- RE: Which relay, switch, connectors, etc to connect pull-type sprayer to tractor power - tedbear : 3/13/2025 08:01
- RE: Which relay, switch, connectors, etc to connect pull-type sprayer to tractor power - MiradaAcres : 3/13/2025 09:17
- RE: Which relay, switch, connectors, etc to connect pull-type sprayer to tractor power - andyn269 : 3/13/2025 17:38
- RE: Which relay, switch, connectors, etc to connect pull-type sprayer to tractor power - DAN SEWI : 3/13/2025 18:09
- RE: Which relay, switch, connectors, etc to connect pull-type sprayer to tractor power - Green Acres Guy : 3/14/2025 03:13
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Which relay, switch, connectors, etc to connect pull-type sprayer to tractor power
