Offboard Harness Question

Posted: Fri Aug 26, 2011 8:37 pm Post subject: Offboard Harness Question

hey guys finishing up makin an offboard harness so sammy doesnt have to fry any more chevy pcms lol. i used this diagram
http://www.naioa.com/v2/modules.php?name=Forums&file=viewtopic&p=569891

question i have is i have a 3 prong illuminated toggle switch with +power, acc., ground prongs but the diagram doesnt show a ground going to the switch so im a bit confused. so far everythings wired up and i have my constant power going to the power prong and the ign pin#19 going to the acc prong is this right? and do i need to ground the remaining ground prong? thanks
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- 02SS - L67,L36, 3.5pulley, VS Cam, Wizaired Intake, DHP Wideband Tuned, Drilled 180* Tstat, SSAC Headers, GMPP Cat-Back, HD Diff upgrade, 20% tint all around, PB of 13.6@102.49mph, 2.18 60ft.

- 95 Monte Carlo LS, K&N Drop In Air Filter, Flowmaster 40 series, 35% tint up front 20% on the back, Chevy bowtie on back windshield, Pioneer Sound System- Traded in Sad

Posted: Sat Aug 27, 2011 9:03 am Post subject:

The ground is only for the switch illumination, just tap into the ground coming from the power source.

Have you verified that the switch toggles power on and off with a volt meter? If it does then it's good to go.
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Posted: Sat Aug 27, 2011 10:45 am Post subject:

so just tap into the rest of the ground wires i have? and i havnt tested it yet but is it right that that i got the +constant power prong hooked to the #20 pin on the pcm harness and the #19 ign. pin hooked to the acc. prong on the switch?
thanks

Posted: Sun Aug 28, 2011 12:58 am Post subject:

Posted: Sun Aug 28, 2011 3:07 pm Post subject:

alright thanks man i appreciate it.

heres a pic of how it sits right now, just gotta connect the ground from the switch to the ground wire and wrap all the wires in black tape.

everything look okay?

Posted: Mon Aug 29, 2011 12:15 pm Post subject:

Heat shrink is your friend.

Posted: Mon Aug 29, 2011 12:51 pm Post subject:

i have a ton of heat shrink if you want any of it pilawa
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2001 Grand Prix GTP - Intake, Borla Catback, Tune
2004 Regal GSX - Turbo, I/C 11.46 @ 122.8mph
http://www.youtube.com/watch?v=j5IqjNkscds

Posted: Mon Aug 29, 2011 2:21 pm Post subject:

WTF is up with the battery clips?
Why not find a 12V 1A wall wart from a laptop computer?
_________________
1998 Silvermist GTP Coupe
Bone stock unicorn
1998 True Green Metallic GTP Coupe
Pullied, cammed, intercooled. With a kiddie seat. It once ran a 13 flat.
1998 True Green Metallic GTP Sedan (retired)
Stock: 14.33 @ 96.5
PB: 13.89 @ 101 mph

Posted: Mon Aug 29, 2011 2:31 pm Post subject:

just finished it. all connections are soldered and i redid the black tape and then black taped all the wires. the reason for the battery clips is i didnt feel like buying an adapter, clips were only $3, and technically its not really for me since i dont have to touch anything on my pcm. its for a few of our other buddies who still have some tuning that needs to be done.
adapter is a good idea. i can find one at walmart?

Posted: Mon Aug 29, 2011 4:02 pm Post subject:

Probably could, or find one from an old computer, printer, scanner, etc.
12V to 14V DC, at least 1 amp.

The only thing about running off a car battery is that if you drop below 11.8V you could end up bricking the PCM. A xformer would be a more reliable power source.

Posted: Mon Aug 29, 2011 4:26 pm Post subject:

for now ill either hook it to another car thats running or to a car battery with a battery charger hooked up

Posted: Mon Aug 29, 2011 5:56 pm Post subject:

The whole point of an offboard is to eliminate the voltage fluctuation that a running car or a car battery produce. Hooking it to a car battery or another running car sounds ass backwards to me. Definitely don't use a car charger.

http://www.radioshack.com/product/index.jsp?productId=3807944&filterName=Type&filterValue=12V+or+less

Posted: Mon Aug 29, 2011 7:22 pm Post subject:

Posted: Mon Aug 29, 2011 8:43 pm Post subject:

just tested it out tonight and it worked perfect. all our cars have pretty new die hard platinums/or optima redtops so voltage is not a problem. as long as voltage is not fluctuating below 12v with car idling there should be no problems at all.
X2 dezldave lol. powertunr wont bitch until your at 11.5ish. dave actually used his offboard once on my car with my battery and it also worked flawlessly.
the adapter is nice but dont feel like spending the $30 for something that im not really gonna use for myself, i just made it to help the other wbody assclowns around here lol

Posted: Tue Aug 30, 2011 2:00 pm Post subject:

worked perfect!

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