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Hi, excuse my english.
I need a little help.
My car is a C5 EURO from the year 2000 and I need to find a switched 12V for the LPG switchboard that consumes +-2A. After reading many posts in this forum, I don't want to connect it to the cables of "accessory power" in the passenger footwell, because I saw several posts where that caused the BCM to fail (I suppose due to high power requirements) so I opted for the via of the fuse 22, but I see that in my car that fuse exists (red circle) and instead the empty fuse is the 12 (blue circle)....
My question is: what fuse is recommended to use? 22 or 12?
I want to use a fuse like this:
...My car is a C5 EURO from the year 2000 and I need to find a switched 12V for the LPG switchboard that consumes +-2A. After reading many posts in this forum, I don't want to connect it to the cables of "accessory power" in the passenger footwell, because I saw several posts where that caused the BCM to fail (I suppose due to high power requirements)...
I really can't see how one thing could affect the other. Just out of curiosity, could you provide a link to a thread where that was discussed?
Those wires in the passenger's footwell are there precisely for that purpose, as long as you don't overload their circuits:
Yellow: switched via Fuse 11 (20A - Accessory Power)
Orange: always hot via Fuse 7 (20A - Cigarette Lighter) and
I "TOTALY" AGREE!! The two 20 amp Auxiliary Circuits have NOTHING to do with the BCM or any other circuit for that matter.
One is connected directly to the battery buss and the other comes directly off of the ignition switch buss. Hell, I have my heated seat controllers for BOTH seats connected to the switched lead along with my radar detector. ZERO issues. Its been connected since the car was new.
That is EXACTLY why GM put it there. So people wouldn't tap into power cables for other modules that WILL effect their operation and integrity.
Use the Aux power and don't beat your self up about old wives tails.
Bill also intervenes in them saying that it does not make sense to relate both facts (the same thing you say to me)... my knowledge is not enough to discuss....
I worry because a BCM failure in the USA is a problem, but in Europe it is a GREAT GREAT GREAT problem because of the shortage and the price of spare parts for this car.
What I would like to know is, in your opinion, which would be the best and safest installation of these 3:
1. connect on the yellow cable of the auxiliary connector with such a connector:
2. with this connector and 2 fuses of 20A to use the fuse 12 that is empty (I will have to verify that it is switched):
3. with the previous connector use fuse 22 which is switched and I believe it is not used. This post is related to this: https://www.corvetteforum.com/forums...ower-help.html
Thanks a lot for your help!!!
Last edited by AjdSpain; May 16, 2019 at 02:09 PM.
I read both post through their entirety. I CAN NOT see how connecting something to a separate power plug/lead that has nothing at all to do with the BCM can have a negative effect on the BCM.
I think it was just fluke, Murphy's Law kind of occurrence that the BCM took a dump the same time. Even GM stated that they couldn't find a reason the BCM fried. They were just good to him to get him off their backs.
You connecting your FUSE pigtail to that fuse block has more connection to the BCM than the AUX connector does.
You can do what ever you want but, like I said; I have a couple of thing connected to my AUX switched lead and every this is fine and always has been.
My thoughts exactly. These connections are widely used to install aftermarket headunits using the PAC ROEM-VET1, but if it makes you feel safer, you can go directly to the battery with a completely independent in-line fuse and switch it with a relay controlled by a connection to any switched source. However, I wouldn't recommend to complicate things unnecessarily.
Here is the C5 SCHEMATIC for the ASRYOFF Fuse #11 Yellow switched AUX wire. As you can see the power junction for that wire is on the other side of the BCM fuse. Along with the wiper motor and the motor controller. Don't use the wipers if you use the same theory as they try to use in the post that you referenced!!
Last edited by Bill Curlee; May 16, 2019 at 04:00 PM.
Use the yellow wire was my first idea, GM put it there for a reason, I guess.....Then I began to search for information about that, found the post about BCM and...well, you know the rest.....
Definitely, I will use the yellow wire.
For a C5 rookie like me, the CF amount of information may be excessive . Thank you both for the clarification.
Another question:
As you can see the power junction for that wire is on the other side of the BCM fuse
Bill, thanks for the diagram and I believe you, but.... I don't know how to read it . I will be happy learning something new if you could explain to me (and maybe could help other people) how to read the "red line" that I drew.
For example, What means D3, A3, B3,,F3? 1 YEL 143, 0.35 YEL 243, 0.8 YEL 443......?
PS: It's not a joke. Really I don't understand the diagram.....and will love learning....TIA
Well, job done!!!!
Finally I use the yellow wire. No problem at all. Everything works as expected, no errors on DIC. The car runs great and the LPG works ok.
Thank you for the information. You are right, no problem using the yellow wire.
Switched 12V '00
I "TOTALY" AGREE!! The two 20 amp Auxiliary Circuits have NOTHING to do with the BCM or any other circuit for that matter. 
. I will be happy learning something new if you could explain to me (and maybe could help other people) how to read the "red line" that I drew.
