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2020 Ram 2500 plow fuse location

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bugmy98

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My son has a 2020 Ram 2500. He recently put on a Boss V Plow and used the upfitter plow wiring under the fuse box. Everything works well but no High beam light power. Wire is the black with blue tracer, no power at the splice, where would he look for the fuse that runs the high beams? Dealer says they don't know location, and are not very helpful. Any help would be great.

Bugmy98
 
A couple questions

  • In his 2500 a Power Wagon? The PW has the wires physically present, but they’re not functional.
  • Are you sending power to the black/violet “plow lighting enable” circuit? That should disable the truck lights and show an icon on the instrument cluster.
 
jsalbre said:
A couple questions

  • In his 2500 a Power Wagon? The PW has the wires physically present, but they’re not functional.
  • Are you sending power to the black/violet “plow lighting enable” circuit? That should disable the truck lights and show an icon on the instrument cluster.
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If everything else is working like se states then its not either of the 2 things you mentioned.
 
I have seen it before where the relay for the high low on the boss setup was bad from OEM so you can try swapping the relays. But I have also seen the OEM truck wires not providing voltage on one or more of the blunt cut wires to trigger the plow relays. If the relay is not the issue then you may have to have the dealer check out the truck wiring
 
H3LZSN1P3R said:
If everything else is working like se states then its not either of the 2 things you mentioned.
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Assuming he meant the other lights are working properly, but it's hard to be sure since he wasn't specific about what "everything" meant.
 
Follow up, there are no fuses for the plow light wiring, as they're digital driver circuits, not power circuits. They should only be used to drive a relay.

Also, the high and low beam drivers are "active low", meaning they're switched to ground when activated, not to 12v. This means the ground pin of the high beam relay coil should be attached to the driver wire. The 12v input side of the lighting relay should go to battery. You shouldn't see 12v on the plow park, low, or high blunt cut wires.
 
jsalbre said:
Assuming he meant the other lights are working properly, but it's hard to be sure since he wasn't specific about what "everything" meant.
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When I said everything was working, I meant that low beam, blinkers, and parking light were working. The black wire with blue tracer is high beam, and when we checked the splice to Boss blue wire for high beam no voltage was present. The truck headlights are shut off when the plow is hooked up like they should be, it is like the Black wire with blue tracer is dead like a blown fuse. They must have a fuse of some kind or solid state breaker so you wouldn't burn down the harness if it shorted. Parking light and blinker still are active on the truck when the plow is on, like the should be. With the plow off the truck headlights work both low and high beam, just no high beam when plow is on.
Beetlemy98
 
bugmy98 said:
When I said everything was working, I meant that low beam, blinkers, and parking light were working. The black wire with blue tracer is high beam, and when we checked the splice to Boss blue wire for high beam no voltage was present. The truck headlights are shut off when the plow is hooked up like they should be, it is like the Black wire with blue tracer is dead like a blown fuse. They must have a fuse of some kind or solid state breaker so you wouldn't burn down the harness if it shorted. Parking light and blinker still are active on the truck when the plow is on, like the should be. With the plow off the truck headlights work both low and high beam, just no high beam when plow is on.
Beetlemy98
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bugmy98 said:
When I said everything was working, I meant that low beam, blinkers, and parking light were working. The black wire with blue tracer is high beam, and when we checked the splice to Boss blue wire for high beam no voltage was present. The truck headlights are shut off when the plow is hooked up like they should be, it is like the Black wire with blue tracer is dead like a blown fuse. They must have a fuse of some kind or solid state breaker so you wouldn't burn down the harness if it shorted. Parking light and blinker still are active on the truck when the plow is on, like the should be. With the plow off the truck headlights work both low and high beam, just no high beam when plow is on.
Beetlemy98
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Its less than a volt for the trigger wires it would not burn anything. You would need a pretty high end meter to see the voltage on them
 
bugmy98 said:
When I said everything was working, I meant that low beam, blinkers, and parking light were working. The black wire with blue tracer is high beam, and when we checked the splice to Boss blue wire for high beam no voltage was present. The truck headlights are shut off when the plow is hooked up like they should be, it is like the Black wire with blue tracer is dead like a blown fuse. They must have a fuse of some kind or solid state breaker so you wouldn't burn down the harness if it shorted. Parking light and blinker still are active on the truck when the plow is on, like the should be. With the plow off the truck headlights work both low and high beam, just no high beam when plow is on.
Beetlemy98
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As I said, you’ll never see any voltage on that wire. It’s a low active, meaning it connects to ground when activated. You get 12v from the battery, feed that to your relay coil, and connect the high beam wire to the ground on the relay coil.
 
jsalbre said:
As I said, you’ll never see any voltage on that wire. It’s a low active, meaning it connects to ground when activated. You get 12v from the battery, feed that to your relay coil, and connect the high beam wire to the ground on the relay coil.
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The plow wire kit is just wires with heat shrink but connectors that connect to the trucks blunt cut wires he should not have to run anything to relays as its already done for you on the opposite end of the harness.
 
H3LZSN1P3R said:
The plow wire kit is just wires with heat shrink but connectors that connect to the trucks blunt cut wires he should not have to run anything to relays as its already done for you on the opposite end of the harness.
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The relays may come as part of the plow wiring, but they still need to be wired up properly. If the plow kit is expecting to get 12v from the truck wiring it’s not going to work. It’s entirely possible the wiring kit from the plow is wrong.
 
jsalbre said:
The relays may come as part of the plow wiring, but they still need to be wired up properly. If the plow kit is expecting to get 12v from the truck wiring it’s not going to work. It’s entirely possible the wiring kit from the plow is wrong.
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No the BOSS plow wiring for the 15+ rams are all the same unless by some strange mishap the wiring wont be wrong and unless they connected the wrong wires to the wrong blunt cut wires its not the plow wiring as there is nothing else to assemble other than the few butt connectors. I have seen on atleast 5 other Rams where the blunt cut wires on the truck have one or more that are faulty.
 
Interesting. Well, either way, he’s still not going to see 12v coming from the truck wiring, so that’s not a good way to test it.
 
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