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Old 01-18-2010, 08:14 AM   #1 (permalink)
diesail
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RAP how-to on NBS (Keyed accessory power)

There have been many questions as to where to locate RAP (Retained Accessory Power) on the NBS trucks. First let me say thanks to heymccall for all the valuable information that allowed this write-up to happen.

RAP is available to us in the MBEC (Mid-Bussed Electrical Connector) located behind the instrument panel to the left of the brake pedal. The MBEC has 10 positions and the one we are going to us is X14. The problem is that RAP here is limited to only 300 milliamps but there are two other battery feeds in the location as well, one is 15 amps and the other 30. So to use the RAP power for anything but the smallest loads is going to require a relay.
Here are the parts you are going to need and the source that I purchased them from but they are available from many other sources as well.

3 Female GT 280 terminals Delphi Part number 15304711 Mouser part number 829-15304711

1 Relay pigtail Parts express part number 330-075
1 Bosch style relay Parts express part# 330-079
1 GM Connector 20791502 (optional)

Here is the relay harness, relay and connectors.



There are 5 wires in the harness connected as follows.

White wire – Relay trigger positive – relay pin 85
Black wire – Relay trigger ground – relay pin 86
Blue – Constant 12v source – relay pin 30
Yellow – NO (normally open) circuit – relay pin 87
Red – relay pin 87a, this wire is not used and needs to be removed.

You will need to install the female terminals on the white, black and blue wires. Since I elected not to spend money for the GM Connector I went ahead and covered my connectors with shrink wrap. I may still pickup the connector but needed to get this done and hadn’t had a chance to get to the dealer and didn’t want to pay GMPartsDirect their freight charges. Here are my finished cable ends.



Remove the cover to the MBEC, it looks like this



Here is a diagram of the MBEC connectors; we need to use X14



A close-up of X14



The connections will be as follows

White wire to Pin 8 - RAP feed
Black wire to Pin 1 - Ground
Blue wire to Pin 2 or Pin 5. Pin 2 has 15 amps which was plenty for my needs. Pin 5 has 30 amps. - Battery feed

The remaining yellow wire will feed your accessories.

Enjoy….

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Last edited by diesail; 01-18-2010 at 08:21 AM. Reason: typo
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Old 04-09-2010, 05:12 PM   #2 (permalink)
diesail
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Just wanted to give a little update. There are two circuits mentioned above as being 15 and 30 amps. If you are looking for the fuses for them they are located in the under hood fuse block. The 15 amp circuit is labeled SEO B1 and the 30 amp fuse is SEO B2.

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RAP (Retained Accesory Power) How-To
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Old 04-22-2010, 05:53 PM   #3 (permalink)
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Quote:
Originally Posted by diesail View Post
Just wanted to give a little update. There are two circuits mentioned above as being 15 and 30 amps. If you are looking for the fuses for them they are located in the under hood fuse block. The 15 amp circuit is labeled SEO B1 and the 30 amp fuse is SEO B2.
Would this be the correct place to access power for tying in my auxilluary fule pum and air bag compressor?
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Old 04-22-2010, 06:23 PM   #4 (permalink)
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RAP is the function that keeps your radio and other accessories on when you shut your truck off and don't open the doors. For your needs, you would probably want a keyed 12V power wire that is active when your truck key is in the on position, not RAP power.

BTW, good, informative writeup Diesail.
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Old 04-22-2010, 06:28 PM   #5 (permalink)
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Quote:
Originally Posted by Brad92 View Post
RAP is the function that keeps your radio and other accessories on when you shut your truck off and don't open the doors. For your needs, you would probably want a keyed 12V power wire that is active when your truck key is in the on position, not RAP power.

BTW, good, informative writeup Diesail.

Where is the best place to grab that power supply. My Truck is 2010 and the guy that installed the stuff went directly to the battery post and i want it to be on a keyed circuit.
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Old 04-22-2010, 09:00 PM   #6 (permalink)
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I do not know where you can get them, but I received a piece with my wireless air kit that slides and wraps around the post of the fuse in your fuse block. In the wireless air kit you need keyed power to power the relay so that it can then pull the power from the battery post. It was such a simple installation - pull the fuse that is keyed which is easy to do by using a volt meter or test light to see which one powers on key - then slide this terminal around the post and slide it back in the fuse slot - this end is crimped to the feed wire. If you need more info let me know.
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Old 04-23-2010, 04:17 AM   #7 (permalink)
diesail
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According to the documentation from GM in the same cavity X14 – pin 7 there is 10 amps of Run/Crank power.
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1800W Xantrex Prosine Inverter & third battery
Lovin my Michelin LTX M/S2 tires
RAP (Retained Accesory Power) How-To
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Old 05-11-2010, 08:30 PM   #8 (permalink)
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I read this several times and I'm still a little bit confused......... If pin 2 has 15 amps available and pin 5 has 30 amps available, that should be all you need to power almost anything. I don't understand what are you using the relay for.

EDIT: I just thought of something........ Maybe pin 2 and pin 5 are hot all the time, and pin 8 is the one that is only hot key-on, so you're using it to trigger the relay powered by pin 2 or pin 5. Is that it?
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Last edited by knaffie; 05-11-2010 at 08:33 PM.
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Old 05-11-2010, 08:51 PM   #9 (permalink)
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Quote:
Originally Posted by knaffie View Post
I just thought of something........ Maybe pin 2 and pin 5 are hot all the time, and pin 8 is the one that is only hot key-on, so you're using it to trigger the relay powered by pin 2 or pin 5. Is that it?
Yep, you got it. Only pin 8 is switched and it only has small amount of juice available so you can't power much of anything from it.
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Lovin my Michelin LTX M/S2 tires
RAP (Retained Accesory Power) How-To
RetroSolutions Super Bright Reverse Bulbs
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Old 05-11-2010, 08:59 PM   #10 (permalink)
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Makes perfect sense.

Thank you very much for posting this. I knew there was a better way to get power under there than cutting into an existing circuit.

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