Administrators BRAAP Posted October 21, 2010 Administrators Share Posted October 21, 2010 Wanting a power supply for bench testing all things automotive, mostly EFI stuff, a 12v and 5v power supply is quite handy. Old PC power supplies are perfect for this, stable 12v in the 15-20 amp range, 5 v in the 20-35 amp range, PLENTY of power for bench testing sensors, powering up ECU's etc. A couple years back I purchased an old PC power supply for dirt cheap to do just that. I am to point now that I could really use a 5 volt power supply to test the '97 BMW M3 fuel tank pressure sensor to see if it has the same voltage-to-pressure scale as the GM version for the LSx conversion. If so, I can just use the BMW sensor, otherwise need to swap out for the GM unit, can't seem to find the values for the BMW sensor anywhere so must test it myself. Any how, went to set up my power supply and it wan't quite working. It makes a buzzing sound, an external CPU fan attached to the wire bundle tries to spin, and even when I hook up a light bulb to load it, it just barely glows. No mater what I do, the 12v side puts out only 2.63v, the 5v side only puts out 2.37v. Bad power supply. This bring us to my first PC, originally a DOS machine, then Winders 3.1, has been in storage for 10 years now, not powered up for at least that long. Knowing I will never use it again, dug it out, plugged it in and it fired right up, woo-hoo, god power supply. Brought back lots of memories from the mid '90's surfing via dial up scrounging what very little info on the net there was on the Z cars. Had one of those "wow, I am getting old" moments chuckling at my attempt to visually customize the PC. Thinking back to not having the readily available information we have now the forums and dedicated sites etc, made me think how all these kids now days would get along without the internet and all this instant communication and access to almost anything information they need? We earned the info we found back then, now days these kids expect the info to be spoon fed to them with no respect or care for how that information was obtained so they could have it! I digress... Then pulled the cover off and harvested the power supply. Quote Link to comment Share on other sites More sharing options...
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