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Auxiliary Battery Wiring

Cable

By Cable,
in 2015-2019 Silverado & Sierra HD Mods

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Cable Enthusiast

Cable

Posted
Posted (edited)

My intention is to install an auxiliary battery for camping in a 20

17 Silverado 2500 using GM's parts. 

 

GM's discussion of Removal/Installation procedure of Positive Auxiliary Battery cable, PN 23386298, on a gas truck with RPO K4B does not mention any connections that would energize the Auxiliary Battery Run Relay, item 10 in the attached drawing. The procedure only mentions connecting the cable to positive battery terminal on the under hood fuse block. The Auxiliary Battery Run relay is needed to energize the Auxiliary Battery relay, item 7 in the drawing.

 

In versions prior to 2014 this energizing voltage came from a connection made to B4 on the Under Hood Fuse Block.

 

Can anyone shed some light how this relay gets it's energizing voltage and where and how the connection is made?

CablesRelaysCoversFuses.jpg

Edited by Cable
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Brricha4 New Member

Brricha4

Posted
Posted

Can anyone tell me if GM’s relay isolates and allows the auxiliary battery to operate in accessory mode or does it only isolate and operate the aux battery when everything is off?  If so, does that only happen when the starter battery is drained a certain amount?   The literature seems non-existent as to what the GM relay is actually doing.  I’m trying to make this mod to operate the vehicles cigarette lighters and outlets to run camping equipment while the engine is off without depleting the starter battery.  It’s not clear to me that this set up is actually doing that.   Would appreciate any insight.  

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Chevyfan3 Enthusiast

Chevyfan3

Posted
Posted

I'm looking into adding the aux battery to my 2016, does any one know if the above listed harness also includes the isolation relay? Also does anyone have a part number for the negative harness? I have searched for info and this and most the threads I'm coming across are incomplete on the install. Thanks for the help!

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bsp9493 New Member

bsp9493

Posted
Posted
On 11/15/2017 at 3:32 AM, Cable said:

My intention is to install an auxiliary battery for camping in a 20

17 Silverado 2500 using GM's parts. 

 

GM's discussion of Removal/Installation procedure of Positive Auxiliary Battery cable, PN 23386298, on a gas truck with RPO K4B does not mention any connections that would energize the Auxiliary Battery Run Relay, item 10 in the attached drawing. The procedure only mentions connecting the cable to positive battery terminal on the under hood fuse block. The Auxiliary Battery Run relay is needed to energize the Auxiliary Battery relay, item 7 in the drawing.

 

In versions prior to 2014 this energizing voltage came from a connection made to B4 on the Under Hood Fuse Block.

 

Can anyone shed some light how this relay gets it's energizing voltage and where and how the connection is made?

CablesRelaysCoversFuses.jpg

 

I am looking at doing the exact same thing with a 2016 Sierra 2500HD.

 

whenever I get close to finding the correct part number for the positive cable, the plug that energizes the relay is NOT the same:(. 

 

I have included pictures of the plug from my vehicle for reference.

 

does ANYONE have a 2016 with this option factory installed?  if so, can you please share the last 8 digits of your VIN so I can track down the correct factory harness.  

 

OR

 

share the partnumber (the ones listed here and the ones I have been able to find do not match the plug in my vehicle.

 

Unfortunately, 3 dealers have been of little help:(

 

Thank in advance

 

d

 

 

IMG_7613.thumb.jpeg.c80516f5618ec33c0a54cb8381775e52.jpegIMG_7614.thumb.jpeg.4df8c275e11e9b0e7300d04abfebe80d.jpeg

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eurobound Enthusiast

eurobound

Posted
Posted
On 11/15/2017 at 3:32 AM, Cable said:

My intention is to install an auxiliary battery for camping in a 20

17 Silverado 2500 using GM's parts. 

 

GM's discussion of Removal/Installation procedure of Positive Auxiliary Battery cable, PN 23386298, on a gas truck with RPO K4B does not mention any connections that would energize the Auxiliary Battery Run Relay, item 10 in the attached drawing. The procedure only mentions connecting the cable to positive battery terminal on the under hood fuse block. The Auxiliary Battery Run relay is needed to energize the Auxiliary Battery relay, item 7 in the drawing.

 

In versions prior to 2014 this energizing voltage came from a connection made to B4 on the Under Hood Fuse Block.

 

Can anyone shed some light how this relay gets it's energizing voltage and where and how the connection is made?

CablesRelaysCoversFuses.jpg

 

Can someone please tell me what exactly is the number 2 point of attachment? I have the factory harness already. I haven't had a good chance to look hard under the hood but was wondering if someone had a picture of the post this attaches to? Looks like its attaching to the fuse box on the back side? Any help would be much appreciated. 

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AbzDad Enthusiast

AbzDad

Posted
Posted
On 11/21/2022 at 9:39 PM, eurobound said:

 

Can someone please tell me what exactly is the number 2 point of attachment? I have the factory harness already. I haven't had a good chance to look hard under the hood but was wondering if someone had a picture of the post this attaches to? Looks like its attaching to the fuse box on the back side? Any help would be much appreciated. 

 It attaches to the back of the fuse box. There is only one connection there, if i remember correctly. You have to remove the old harness and replace it with the new one in the same place. 

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eurobound Enthusiast

eurobound

Posted
Posted
13 hours ago, AbzDad said:

 It attaches to the back of the fuse box. There is only one connection there, if i remember correctly. You have to remove the old harness and replace it with the new one in the same place. 

Thanks. Yeah, I've had the harness sitting on my floor for quite a while and only after studying the harness and the pictures did I realize it replaces the original wire to the fuse box. Really appreciate you confirming that. I'm getting my batteries on Friday and will instal this weekend and will post some some pics. 

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