Why isn't Rosin Core working ?
jbrew, for what it's worth, I always use electronic solder for any electrical connection. It's a finer wire than ordinary solder, it has a rosin core (no extra rosin needed), it has a higher tin content than "ordinary" rosin core solder, and, it has a lower melting temperature than the "ordinary" stuff, so you're less likely to damage delicate electronic devices. I've also used silver solder on occasion, but that's probably overkill.
I just recently took four power window and door lock switches apart because the LEDs in them were no longer lighting. I found cracked circuits around the resistors on their circuit boards and was able to repair them using small pieces of 26 gauge wire and this electronic solder. No heat damage to anything.
You can get electronic solder at Radio Shack or any other electronics supply store.
- Jack
I just recently took four power window and door lock switches apart because the LEDs in them were no longer lighting. I found cracked circuits around the resistors on their circuit boards and was able to repair them using small pieces of 26 gauge wire and this electronic solder. No heat damage to anything.
You can get electronic solder at Radio Shack or any other electronics supply store.
- Jack
jbrew, for what it's worth, I always use electronic solder for any electrical connection. It's a finer wire than ordinary solder, it has a rosin core (no extra rosin needed), it has a higher tin content than "ordinary" rosin core solder, and, it has a lower melting temperature than the "ordinary" stuff, so you're less likely to damage delicate electronic devices. I've also used silver solder on occasion, but that's probably overkill.
I just recently took four power window and door lock switches apart because the LEDs in them were no longer lighting. I found cracked circuits around the resistors on their circuit boards and was able to repair them using small pieces of 26 gauge wire and this electronic solder. No heat damage to anything.
You can get electronic solder at Radio Shack or any other electronics supply store.
- Jack
I just recently took four power window and door lock switches apart because the LEDs in them were no longer lighting. I found cracked circuits around the resistors on their circuit boards and was able to repair them using small pieces of 26 gauge wire and this electronic solder. No heat damage to anything.
You can get electronic solder at Radio Shack or any other electronics supply store.
- Jack
Are you thinking of Acid Core maybe? Prolly not - I haven't been desperate enough to use that stuff
Last edited by jbrew; Feb 4, 2009 at 01:30 PM.
Thanks Jack. Yea, that's what I use and RS is where I get it - Same stuff I use on Mother boards or any PCB as far as that goes
I use silver bearing solder once in awhile, not on the wires. - Lead free for food grade (water lines).
Are you thinking of Acid Core maybe? Prolly not - I haven't been desperate enough to use that stuff
Are you thinking of Acid Core maybe? Prolly not - I haven't been desperate enough to use that stuff

The solder I was calling the "normal stuff" is usually 40/60 rosin core (40% tin/60% lead). Electronics solder is 60/40 rosin core - it's the ONLY thing I use now.
I was very puzzled that you had to use separate flux to get that connection soldered. I've NEVER encountered anything like that in my life. The flux only cleans oxides off the surfaces to be soldered, it really doesn't do much else. I wonder if your iron was too hot? If it is, it can cause oxidation before the solder "wets" the surface, which will cause it to "run off".
- Jack
I use 60/40. - Haven't seen 40/60 before. Not all automotive wiring is the same, lesson learned in this case. I don't think I've put this much time into soldering wires in the past lol. I tried different heating methods, pencil, Iron, gun, even a mini torch. Also, cleaned and re-cleaned the wire / cleaned tinned the tips. Steve suggested flux, I thought about that before hand, but never needed it before, so I didn't think it was going to work. Tried it, that worked right away.
Yea, I know what Acid core is, that's why I said "probably not" - After stating you may be thinking of that, - really didn't think you were.
Anyway,tore that harness apart for a re-do. I have a solid joints now. All is good.
Yea, I know what Acid core is, that's why I said "probably not" - After stating you may be thinking of that, - really didn't think you were.
Anyway,tore that harness apart for a re-do. I have a solid joints now. All is good.
Last edited by jbrew; Feb 5, 2009 at 08:50 AM.





