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Join Date: Mar 2009
Location: Plano, TX
Posts: 511
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newbie question
Could someone please point me to the appropraite thread explaining how to correctly, and most importantly, safely, test a relay? My experience with electrical matters is definetly lacking. I am willing and ready to learn, but don't want to damage anything in the process.
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1982 928 S Euro 5 speed |
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09-05-2009, 09:59 AM
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Or just tell me on this thread?
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1982 928 S Euro 5 speed |
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09-05-2009, 10:53 AM
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Which one are you trying to test? Sometimes there are more than one of the same relay. If you know that relay works perfectly (ie: window goes up and down) and the one you need to test is the same relay, then just switch them out.
Alan is electrical guru and chimes in once in awhile so you may have to wait and be patient for your answer.
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD** 
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09-05-2009, 12:51 PM
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I'm trying to figure out why the entire hvac system is not working.
I pulled the "Fresh Air (HVAC) Blower" relay, ran a hot wire from the CE panel to pole 30 on the relay, a wire from pole 30 to pole 87, turned the ignition switch to #2, and then put the test light on pole 87. It lit up, so the relay is good. Plugged it back in, and nothing. Then I did something I was very nervous about, but luckily had a positive outcome. I took a piece wire and bridged the 2 points on the CE panel where pole 30 and 87 on the blower relay plug in. It shot a spark, but I checked my fuses and they were good. I plugged the relay back in, and whoo-hoo, the blower now works! You know, "Even the sun shines on a dogs a** some days." It only blows through the defrost vents though, so I will be going back to your thread "Heat through door vents" to troubleshoot.
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1982 928 S Euro 5 speed |
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09-05-2009, 02:30 PM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
Posts: 4,528
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get a fuse relay chart here www.928gt.com and replace all of the fuses with good fuses check for the corrct PN of the relays and their locations.
From your post you had a failed fuse if the whole system isnt working and jumping it may have welded it back together
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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09-05-2009, 04:24 PM
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Merlin- I replaced EVERY single fuse with new ones a few weeks ago after I pulled the CE panel and cleaned all of the contacts with a drimmel brush. To be honest, I don't know what the spark did, but bridging across to those 2 contacts did something. All fuses were good before the incident, and all fuses are good after it too. Part of me is curious as to what happened that made the blower work, but the other part of me doesn't really care because it DOES work now and that's all that really matters.
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09-05-2009, 04:48 PM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
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I think you should remove the resistance pack from the blower duct and inspect it its held in with 2 screws careful you dont drop them into the well , use a magnet near the screw as it comes out
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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09-05-2009, 07:37 PM
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Will do after I test the lines with the MityVac.
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1982 928 S Euro 5 speed |
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09-06-2009, 09:56 AM
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