A Switch Pro is ten three-way section switches, a master, a rate bump switch and a built-in boom and product node, talking to an Envizio Pro, Viper Pro or (through an adapter cable) Viper 4 / Viper 4+ over CAN. When sections stop answering or the console cannot find the Switch Pro nodes, the box itself is rarely the problem. It is almost always power, ground, or one of the two long cables between cab and sprayer. The trick is figuring out which cable before you buy parts.
1. How it is cabled
Per the Raven Switch Pro Installation & Reference Manual, the console's interface cable feeds logic power to the Switch Pro from its auxiliary power output, and CAN runs on the same cabling. Section valve power, control valve, flow meter and boom sense leave the Switch Pro on the large round 37-pin console cable (SCS 4400-style; a 440/450 system uses adapter cable 115-0171-803). That cable runs through the cab to a 37-pin connector at the tractor hitch. From the hitch, the machine cable (Raven's product or flow control cable) runs the drawbar to the boom valves, control valve and flow meter.
- Console shows no boom or product nodes, section status boxes grey or inactive — no logic power to the Switch Pro, or CAN not connected. Look at the Logic Power LED on the Switch Pro. Raven says it lights green when the field computer's power is on. Off means the auxiliary power lead, console power/ground, or a fuse.
- Nodes found but no section will turn on — the manual lists this as a faulty CAN high-current power connection. Valve power comes in on the console cable, not the logic power plug. Raven's test is voltage between pins 1 and 37 at the Switch Pro interface port.
- One section dead, the rest fine — a single conductor or a single pin. Could be in either cable, or the valve itself. Swap the valve plug with a neighbor to rule out the valve.
- Sections come on in the wrong order — crossed pins after a repair or a re-pin, or a switch set-up change. If switch 3 now runs valve 5, two wires are in each other's cavity.
- Works until you turn or hit a bump — a cracked conductor at the hitch drape or a corroded hitch pin. Also check for remote section switches left on; the manual says they override the Switch Pro.
- Dies when the sprayer is plugged in — a short to ground in the machine cable or a bad valve. Unplug valves one at a time.
2. Why it fails
Raven's manual says it plainly: many problems can be fixed by correcting improper power and ground wiring. Ground goes to battery negative, not the frame. After that, suspect the two 37-pin cables, because they live in the worst spots on the machine. The console cable gets pinched in the cab door seal daily. The hitch end hangs in the open, gets dragged, dunked in fertilizer and left uncapped all winter. The machine cable chafes on the drawbar and gets soaked at every fill. A 37-pin connector with green crust on three pins will pass continuity on the bench and still drop out under load.
3. Isolating console cable from machine cable
Console on, master and all ten sections ON (not ACCU), pump locked out and plumbing depressurized.
- Unplug the 37-pin connector at the hitch. Look before you measure. Bent, pushed-back or green pins are the answer more often than not.
- Test the console cable end first. With the master and a section switch ON you should read battery voltage on that section's pin to the ground pin at the hitch connector. Use the pin diagram in the Switch Pro manual or SCS 4400 cable drawing for cavity numbers; adapters differ, so we do not print them here. If the voltage follows the switch, the console, Switch Pro and console cable are fine.
- If a section pin is dead at the hitch, check the same pin at the Switch Pro end. Dead there too is the Switch Pro or its high-current power; live there is a broken conductor in the console cable.
- Then test the machine cable. Check voltage at each valve plug with its switch on. Then continuity end to end on every conductor, every pin to every other pin (should be open), and every pin to the shell. Flex the cable at the hitch and boom while you watch the meter.
- Crossed sections show up as continuity from section 3 at the hitch to section 5 at the boom. Move the contacts back to the right cavity; do not re-wire the switch box to match.
4. Cables and parts we stock
| Problem | What to use |
|---|---|
| Console cable broken at the cab door or hitch | Switch Pro 37-pin console cable (custom built), console through the cab to the hitch; we build it to your length |
| Machine cable chafed or corroded at the hitch | Switch Pro 37-pin machine cable (custom built), hitch to the sprayer |
| Either cable needs to be longer than stock | Cable length, per foot added to a custom build |
| Viper 4 / Viper 4+ on Switch Pro cabling | Raven 115-0172-023 adapter cable, Viper 4 / Viper 4+ to Viper Pro cabling |
| Not sure which cable is bad | Cable Check Out bench test, send us the harness and we test every pin |
5. Re-pin or replace
- One pushed-back or bent pin on an otherwise clean connector: re-seat or replace the contact and move on.
- More than two or three corroded pins, or green crust behind the connector: replace the cable. Corrosion wicks up the strands and the next pin goes in a month.
- After any re-pin, run the section switches one at a time at the boom and confirm each valve follows its own switch before you spray.
- Nodes missing after a cable change: Raven's fix is Retry CAN Communication, then readdress nodes if they still do not show.
Not sure which cable you have or how long it needs to be? Send a photo of both connector ends and the console model to sales@spraycenter.com or call (509) 838-2209.
Switch Pro 37-pin (J1) console connector pinout
This is the 37-pin connector on the Raven Switch Pro harness, as wired in our console and machine cables. The wire number on the drawing matches the pin number, so wire 28A is pin 28. The harness breaks out into six shielded sensor cables: CBL1 speed, CBL2 serial, CBL3 flow 2, CBL4 flow 1, CBL5 pressure 1, CBL6 pressure 2. Use it to check continuity end to end, to find which pin a dead boom section rides on, or to confirm power and ground before condemning the Switch Pro.
| Pin | Wire | Function |
|---|---|---|
| 1 | White 14 ga | Ground (−BATT) |
| 2 | Orange/White 14 ga | Remote master |
| 3 | Orange 14 ga | +12 V switched |
| 4 | Black 18 ga | Boom 1 |
| 5 | Brown 18 ga | Boom 2 |
| 6 | Blue 18 ga | Boom 3 |
| 7 | Black/White 18 ga | Boom 4 |
| 8 | Brown/White 18 ga | Boom 5 |
| 9 | Blue/White 18 ga | Boom 6 |
| 10 | White/Black 18 ga | Boom 7 |
| 11 | White/Brown 18 ga | Boom 8 |
| 12 | White/Blue 18 ga | Boom 9 |
| 13 | Pink 18 ga | Boom 10 |
| 14 | Violet 18 ga | Fan signal |
| 15 | Green 18 ga | Decrease (control valve) |
| 16 | Yellow 18 ga | Increase (control valve) |
| 17 | Shielded cable, red 22 ga | Serial RX (CBL2) |
| 18 | Shielded cable, white 22 ga | Serial CTS (CBL2) |
| 19 | Shielded cable, black 22 ga | Serial TX (CBL2) |
| 20 | Shielded cable, green 22 ga | Serial DTR (CBL2) |
| 21 | Shield / drain | Signal ground: flow 1, flow 2, speed and serial shields all land here |
| 22 | Shielded cable, black 20 ga | Flow 2 +5 V (CBL3) |
| 23 | Shielded cable, white 20 ga | Flow 2 signal (CBL3) |
| 24 | White/Green 18 ga | Bin level signal |
| 25 | Shielded cable, black 20 ga | Flow 1 +5 V (CBL4) |
| 26 | Shielded cable, black 20 ga | Speed +5 V (CBL1) |
| 27 | Shielded cable, red 20 ga | Speed signal (CBL1) |
| 28 | Shielded cable, red 20 ga | Flow 1 signal (CBL4) |
| 29 | Shield / drain | Pressure 1 and pressure 2 ground |
| 30 | Shielded cable, black 20 ga | Pressure 1 +12 V (CBL5) |
| 31 | Shielded cable, red 20 ga | Pressure 1 signal (CBL5) |
| 32 | Yellow 16 ga | CAN high |
| 33 | Green 16 ga | CAN low |
| 34 | Shielded cable, black 20 ga | Pressure 2 +12 V (CBL6) |
| 35 | Shielded cable, white 20 ga | Pressure 2 signal (CBL6) |
| 36 | Red 14 ga | +BATT (fused 15 A, F1) |
| 37 | Red 12 ga | +BATT (fused 30 A, F2) |
Pinout from the Raven Switch Pro harness wiring diagram as built by Spray Center Electronics. Shielded-cable drains (pins 21 and 29) are grounds, not signal wires: a shield that reads open to pin 21 will make a flow or speed sensor read erratically even though the signal wire tests good.
Spray Center Electronics builds Raven Switch Pro and SCS 440/450 console and machine cables and stocks Raven adapter cables and connectors in Spokane, WA. Test procedures come from the Raven Switch Pro Installation & Reference Manual; use the pin diagram in your manual for cavity numbers. Send a photo of the connector and we'll match it before you order.