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Club4AG Forum Topics » General Technical Discussions » Electrical Fault Finding 03 - DRY JOINT in Soldered Connections Print  Email  Subscribe  RSS  Help

Electrical Fault Finding 03 - DRY JOINT in Soldered Connections Author Post jondee86 Reggae Rules... Offline 4374 posts [96%] Wellington, NZ  Electrical Fault Finding 03 - DRY JOINT in Soldered Connections 11:18 PM 11/21/2011 Reply  Edit The problem of DRY JOINTS in soldered connections, particularly on PCB's, is well known in the electronics and electrical industries. This fault is responsible for a lot of the "Car starts and runs fine, but randomly shuts down, and won't start until it has sat for 10 minute... " problems. This pic is lifted from a good article on a Honda site, but what is written applies equally to pretty much any older car that uses electro-mechanical relays. No need to read the whole thing as the first paragraph describes the problem in detail. http://www.tegger.com/hondafaq....html So before you go spending your hard earned cash on new relays, take a look inside and see if it has a dry joint. If it has, any electronics repair shop should be able to fix it for a couple of bucks. Cheers... jondee86 jondee86 has been a member for 735,126 days. Give a person a fish, they eat for a day. Suggest they search before posting, and they learn a skill for a lifetime.

VitriumGTS Offline 4730 posts [96%] San Jose/San Diego CA   » 12:53 AM 6/20/2012 Reply  Edit Oh man! I've been wondering whats been causing my very random and unreproducible engine cutting out issues. I suspected something in the wiring or the relays too so i went a little overboard and decided to touch up my blacktop engine harness wiring (shortening, lengthening, and getting rid of the bulk). The only thing I found was my junction block ground point bolt was a little loose. But even tightening that didn't solve the instantaneous/random loss and recovery of ECU power while the engine is running. Good stuff. I was about to make a thread about it too My RHDJapan.com receipt said: "Your order # is: 100001986". The AE86 gods really are looking out for me. MisterJerk Member Offline 283 posts [100%] Springfield VA  Re: (VitriumGTS) » 6:04 AM 6/20/2012 Reply  Edit I had the same strange cut off and die when she warms up. after testing everything and trying everything it turned out to be the Autozone dizzy i had to buy when i couldnt find a used one. Luckily my buddy had one with destroyed wiring, a little cut and paste and she was good to go with a 30 year old dizzy and rigged wiring. Jerk Racing! ジャークレーシング Jeonsah Member Offline 1814 posts [95%] Co   » 8:50 AM 6/20/2012 Reply  Edit The main relay in my honda crx had this problem. Everytime I would attempt to start the car after 2-10minutes of it just running, it would be a pita. So I just took it out myself and soldered the joints. Works like a charm now ^_~ Great tip Jondee! WTB AE86 Best Motoring International Vol. 42. Pm if you have it! Red Offline 9661 posts [78%]  Re: Electrical Fault Finding 03 - DRY JOINT in Soldered Connections (jondee86) » 11:02 AM 6/20/2012 Reply  Edit In the States we're more likely to call that a "cold solder joint" meaning the solder was never originally heated up enough to properly flow and fill. They seem to become more of a problem as circuits age though, which is why it always pays to look very closely at "bad" electronics. A $5-10 basic pencil soldering iron kit from Radio Shack or any big box store can fix that, instructions for basic soldering are all over online. If you can melt a pat of butter in a pan, you can do this repair. Usually it just needs to be reheated and allowed to cool properly, adding a touch of new solder if the original was skimpy. Practice on something dead and junked if you're at all worried. $30 should buy to a really good soldering gun (i.e. Weller) and a larger roll of solder. --Original owner, '85 Corolla GTS. Will trade for a Cadillac-Gage V150, or a Ford GT, in similar condition. VitriumGTS Offline 4730 posts [96%] San Jose/San Diego CA   » 9:36 PM 6/20/2012 Reply  Edit I found a spare circuit opening relay that I can open up and compare to the one in my car. Hopefully I can get to the bottom of this! My RHDJapan.com receipt said: "Your order # is: 100001986". The AE86 gods really are looking out for me. Red Offline 9661 posts [78%]  Re: (VitriumGTS) » 5:49 AM 6/21/2012 Reply  Edit Bravo. And having done that, I should warn you that the wires are DELICATE and the wire that leads to the middle (second) coil position especially delicate. Poke around gently. --Original owner, '85 Corolla GTS. Will trade for a Cadillac-Gage V150, or a Ford GT, in similar condition. kunfuzion Offline 793 posts [100%] Ca  Re: Electrical Fault Finding 03 - DRY JOINT in Soldered Connections (jondee86) » 1:18 PM 6/22/2012 Reply  Edit Great info. Thanks! ....just a slow red car and a crippled hatch....

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