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That one for 500 bucks with cards is not a bad deal, they (mine) cost 6000 new
I am about the luckiest man in America who walked away from the dealer with one without stealing it
https://rebuiltcarparts.com/shop/gem...65b-14b205-cb/ Thanx all!! There is this rebuilt GEM ($340.00 link attached) OR a used one on ebay..What would you do?? To spend all the time and money for a repair (specialized diag. tools/research etc.. for just this one truck is just not worth it!? I believe it's the gem causing this problem because there IS a defective cap on it....It may be a gamble but we'll see. I have alot of scanners,diagnostic tools etc.. I've collected over 35 years.. Not buying anymore..especially a one off $$$ specific one LOL.. I sure would like to know what the spec is on that cap. though!? WOW!..just found a my FACTORY service manual! volume 2...A little worn but all there..and about 6 inches thick with the blue binder..Taking a look at the flow charts and pin outs for test and operation..
Last edited by FORREST2; Mar 13, 2026 at 09:46 AM.
Because I'm curious, and hate to spend $400 to fix a $1 part, I would buy a handful of caps in a range of 0.05 to 0.47uf. Desolder the bad cap and install temporary test leads so I can easily swap caps to see if any will fix the problem. This has a low chance of success but at least I will never be haunted by not knowing. Digikey, Mouser and Newark will have the caps. Shipping probably cost more than the parts.
Here's an odd, probably distasteful, thought - solder a new cap on top of the old one instead of desoldering the broken one. Since the old cap is open circuit it really just acts as a raised set of pads. If it works and it bothers you can put the effort in to desoldering/removing.
Thanx again... BUT I really don't want to replace cap without knowing specs ( capacitance voltage)..They are like little batteries.. don't want to allow more voltage than is required for possible damage to other items down the line.Also possible more damage to the gem which I can still make operate!. Also that cap.. is actually around 2mm long and 1 mm. wide.. the size of a gnat ! VERY tiny..Also construction "dielectric" E.G. ceramic/foil/paper..etc.....Sooo..for now I will just reset when needed till I decide what gem to buy...Also no info in the full factory manual for gem component descriptions... Thanx again!
Last edited by FORREST2; Mar 13, 2026 at 01:17 PM.
Well I bought "rebuilt GEM from "rebuilt parts.com"// Taking a chance, did not feel comfortable buying a "used untested ebay GEM" .. I'll update when I get it .. thanx all!
Just because I was curious...I desoldered and soldered and tiny capacitor on a random circuit board I had in the bone pile (I save PCBs for parts). It was relatively easy. I have a standard Weller soldering station and a magnifying glass attached to the bench. I used desoldering tape and flux. The cap was 1.9 nF.
So, physically it is not too bad. But the capacitor value can't be determined if it is damaged. Many of these tiny caps are used for high frequency noise filtering and won't kill a circuit if they fail open. But anything is possible.
Here are after and before photos.
AFTER
BEFORE
Last edited by Don Ridley; Mar 15, 2026 at 04:53 PM.
