Re: Investigator II problems

tim s · Feb 12, 2016

I still have "Grey" areas on sorting these out,,but one way I prove the box is to send it to Ag Exspress in Sulpher Springs indiana 765-533-4809.. They test and rebuild these with a fast turn around, I send a lot of those pesty circuit boards from under the left cowl, to them, the boards cost $1100 from Deere, they fix them for about $200...It's good to be able to bench test a unit to know where your are to begin with..

newgenjdcollector · Feb 12, 2016

I have also sent one to ag express for repair. They are not too far from me. I had it back in just a few days and the cost was well worth it when you consider finding a replacement.

Craig C · Feb 13, 2016

Speaking of those boards on a 55 series under the cowl, I had one that gave me fits too. AG express has been very good and helpful to us however, they didn't catch what was really going on with our board. They repaired a trace going to the zenor diode, that regulates the voltage. Evidently it didn't show up s problem until it was installed back into the tractor, probably because of amperage flow with relays hot verses just checking circuits with meter. Basically our diode went to ground and blew the traces. It would completely take out the dash. We had a hard time identifying a diode to replace it with. It isn't like you can just go buy one at Deere. Looking at the whole electrical system, I wonder why they didn't put the regulating diode between the starter and the key relay, because to my understanding it's purpose is to protect the dash electronics from s voltage spike, which could happen if an alternator goes wild. I don't think it was supposed to do anything unless voltage exceeded 16 volts. it has been a while, but this post caused me to think back about that episode.

Re: Investigator II problems

tim s

Well-known Member

newgenjdcollector

Member

Craig C

Member