Jump to content

Upfitter Switch Primary Power location

Hutchy

By Hutchy
in Modifications, Wheels & Tires

 Share

Recommended Posts

Hutchy Enthusiast

Hutchy

Posted
Posted

Hi Everybody,

 

I recently purchased and installed the OEM upfitter switch kit, to my 2019 GMC Sierra AT4; looks nice and clean. Anyway, I'm about to connect a device, but realized there's no pwer going to the (kit supplied) under-dash auxillary fuse/relay box? The switch do illuminate, but there's no power coming out of the leads. I'm assuming that I need to install some primary fuses, because my truck didn't originally come with the 9L7 option? I've COMBED the internet and can't really find where the main power junction is located. There was a diagram that said Fuse #94 should be one of the inputs, but the under hood distribution box only lists up to #92; with none of them being identified as related to these upfitter/auxillary switches? Hopefully someone can help out..

 

 

Thanks in advance,IMG_7474.thumb.PNG.b4f67b8e87fda7f7c7887621c51f900e.PNGIMG_7474.thumb.PNG.b4f67b8e87fda7f7c7887621c51f900e.PNGIMG_7474.thumb.PNG.b4f67b8e87fda7f7c7887621c51f900e.PNGIMG_7474.thumb.PNG.b4f67b8e87fda7f7c7887621c51f900e.PNG

newdude Senior Enthusiast

newdude

Posted
Posted
13 minutes ago, Hutchy said:

Hi Everybody,

 

I recently purchased and installed the OEM upfitter switch kit, to my 2019 GMC Sierra AT4; looks nice and clean. Anyway, I'm about to connect a device, but realized there's no pwer going to the (kit supplied) under-dash auxillary fuse/relay box? The switch do illuminate, but there's no power coming out of the leads. I'm assuming that I need to install some primary fuses, because my truck didn't originally come with the 9L7 option? I've COMBED the internet and can't really find where the main power junction is located. There was a diagram that said Fuse #94 should be one of the inputs, but the under hood distribution box only lists up to #92; with none of them being identified as related to these upfitter/auxillary switches? Hopefully someone can help out..

 

 

Thanks in advance,

 

 

You've combed everywhere but the proper places.

 

UI-Bulletin-153c.pdf (gmupfitter.com) - full install instructions for the upfitter switch kit.

 

UI-Bulletin_147b-Snow-Plow-power-provisions.pdf (gmupfitter.com) - You need p/n 84669070 to activate the 12v to the upfitters in the battery junction box.  

 

  • Like 1
Hutchy Enthusiast

Hutchy

Posted
  • Author
Posted
5 hours ago, newdude said:

 

 

You've combed everywhere but the proper places.

 

UI-Bulletin-153c.pdf (gmupfitter.com) - full install instructions for the upfitter switch kit.

 

UI-Bulletin_147b-Snow-Plow-power-provisions.pdf (gmupfitter.com) - You need p/n 84669070 to activate the 12v to the upfitters in the battery junction box.  

 

I replied a while ago, using my mobile, but evidently did not go through; so ignore any duplicate responses, please.

 

Thank you for supplying those links. I did, however, referred to them just prior to installing the kit. The OEM kit was a complete kit and included the battery terminals, bus bars and fuse. There is confirmed power across the fuse in the battery compartment; it's just not present at the auxiliary fuse box. That's why I'm assuming there is some sort of other primary fuse that may be missing somewhere in the circuit; like a feedback loop to energize the relays? 

newdude Senior Enthusiast

newdude

Posted
Posted
2 hours ago, Hutchy said:

I replied a while ago, using my mobile, but evidently did not go through; so ignore any duplicate responses, please.

 

Thank you for supplying those links. I did, however, referred to them just prior to installing the kit. The OEM kit was a complete kit and included the battery terminals, bus bars and fuse. There is confirmed power across the fuse in the battery compartment; it's just not present at the auxiliary fuse box. That's why I'm assuming there is some sort of other primary fuse that may be missing somewhere in the circuit; like a feedback loop to energize the relays? 

 

 

I'd be going over all your connections then.  With the battery fuse kit installed via the bus bar, it should be providing power to that 60 amp fuse.  The opposite end of that fuse is where the power wire for the aux fuse block (the one for the switches that is installed under the dash) gets attached to.  The wire that is fed through the firewall grommet.  

 

Also look at the last 2 pages in that bulletin #153 the first one I posted and check those fuses for having them hot at all times or hot with the truck on/running only.  

 

We had a tech install one for a 2500hd (same parts) and everything was hot and live after the install.  

Hutchy Enthusiast

Hutchy

Posted
  • Author
Posted
14 hours ago, newdude said:

 

 

I'd be going over all your connections then.  With the battery fuse kit installed via the bus bar, it should be providing power to that 60 amp fuse.  The opposite end of that fuse is where the power wire for the aux fuse block (the one for the switches that is installed under the dash) gets attached to.  The wire that is fed through the firewall grommet.  

 

Also look at the last 2 pages in that bulletin #153 the first one I posted and check those fuses for having them hot at all times or hot with the truck on/running only.  

 

We had a tech install one for a 2500hd (same parts) and everything was hot and live after the install.  

ya, I'll try chasing it down again today. The truck is always on Acc, because I believe the kit was designed to energize upon ignition source.. But if that lead from the battery is the primary source and there's no other ancillary circuit; I can't help to wonder what those wires are for, that connect into the main harness.. I'll update later

 

Hutchy Enthusiast

Hutchy

Posted
  • Author
Posted
23 hours ago, Hutchy said:

ya, I'll try chasing it down again today. The truck is always on Acc, because I believe the kit was designed to energize upon ignition source.. But if that lead from the battery is the primary source and there's no other ancillary circuit; I can't help to wonder what those wires are for, that connect into the main harness.. I'll update later

 

Found it. Turns out the lead power wire wasn't making a proper connection; I'm assuming it wasn't seated when I inserted it into the connector and must have pushed it out just enough to look like it was plugged in, but not making contact... Thanks for taking the time to respond to the thread. 

 

Cheers,

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • CamGTP
      Gas Prices

      By CamGTP · Posted

      It varies a ton around me. Some places are still at $5.00 or higher and others are way down into the $4's.   Offroad diesel was $4.02 at the one station I passed today.
    • Hdwrguy
      2027 Chevrolet Silverado: Official Discussion

      By Hdwrguy · Posted

      So after reading the reveal from Chevrolet, I kept asking myself...why did the trim levels change?   Here are the official ones:   Work Truck (WT): The quintessential fleet truck, built with durable, easy-to-clean interiors for commercial or utilitarian use. Custom: A stylish, road-oriented trim that adds a more refined appearance, standard dual exhaust, and modern exterior styling. Custom Trail Boss: An entry-level off-roader featuring a 2-inch factory suspension lift and 34-inch mud-terrain tires on a budget. Silverado: Serving as the new base consumer truck (replacing the previous LT trim), it comes standard with the Z71 off-road package when equipped with 4WD. Trail Boss: Steps up the off-road hardware with the 2-inch lift, 34-inch tires, monotube shocks, an exclusive off-road hood, and more premium interior options. ZR2: The flagship off-roader. It boasts 35-inch mud-terrain tires, Multimatic DSSV dampers, front and rear electronic lockers, forged carbon-fiber interior accents, and an available hardcore Bison Edition (co-developed with AEV). High Country: The pinnacle of luxury. It replaces bright chrome with modern satin chrome, 22-inch wheels, premium leather, real wood interior trim, a panoramic sunroof, and an exclusive front-passenger touchscreen. As others have stated, why would you want a Silverado - 'Silverado' - wth?? LT needs to remain!!!   Also, there will no longer be a dedicated Z71 model.  All 4x4 trucks will have the Z71 package. Carplay is also something that cannot be removed.  Hopefully it will remain.     I am excited about the 5.7L V8 (350 C.I.D.)  Old school Chevy power.  My only concern is whatever version of AFM/DFM cylinder deactivation.  Too bad that isn't an option a buyer can choose to have or not.   I will definitely be stopping by my local dealership when these trucks start showing up.
    • richard wysong
      Gas Prices

      By richard wysong · Posted

      I haven't seen diesel for less than $5.30 anywhere in my area
    • Chuck FB
      OCI, not when but why?

      By Chuck FB · Posted

      The not as clean as one would assume theme with the new engine oil, that reminds me of comments over the years with mechanics not always being so on board with filling an oil filter, not from the center anyway due to that typically being the clean side of the filter, danger of some contaminant falling into the filter if not careful but the realization now that the oil may not be as pure as one had assumed it would surely be. Yes it would be possible to fill from the small holes but that means messing with something to prop open the anti drain back valve if the filter is so equipped and not damage that valve in the process. Me, I have hardly ever prefilled an engine oil filter however I have prefilled diesel fuel filters with a filter on a fuel bulk tank and for anyone that has messed with diesel engines with filters and units that have a limited or no way of priming them, putting on a dry filter is a bad day to say the least with those crappy systems. But anyway back to not so clean engine oil, indeed perhaps its not so bad after all that I have not made a practice of prefilling oil filters.    As Grumpy Bear commented on keeping things clean, that I really have to wonder what the typical practice is at a dealer or any other shop that changes engine oil, do they make sure to wipe or wash off the oil plug and certainly if it fell into some gunk or onto a dirty floor, or that they wiped the filter mounting flange and didn't go and use some dirty rag and end up adding dirt to the inside of the head of the filter mount. Or be careless in how they stored or handled the new filter and if they were bumping into items under the vehicle with the filter opening facing up and having dirt drop right into the filter and if so right into the threaded center that is on the clean side. The top side, did they clean away the built up gunk that may be around the filler before removing the cap or to be really careful at that point that something right close to the filler hole that was hidden under the caps flange won't fall into the engine. Or did they clean the funnel or was that just laying there covered in oil from the oil change before and dust kicked up from sweeping the floor stuck to the oil and now that will go running into the next persons engine due to just not cleaning the funnel as "they won't know anyway" attitude as that young guy is more worried about taking a break so he can go outside and smoke a joint. Just random points that came to mind when I think about what some hired personnel may do that the shop foreman has no idea of or perhaps the whole attitude of some shops may be "eh ... who cares, they will never know the difference anyway".  
    • CamGTP
      Gas Prices

      By CamGTP · Posted

      $3.69 for 87 octane.   $4.24 for Diesel in town.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...