Jump Starting truck that has Inverter

I have recently returned to my truck (International 9400) to find a dead battery at the yard. I attempted to Jump start it from the truck next to me only it would not seem to take enough charge to start. I ended up turning the problem over to the mechanics at the yard and they managed to start the truck but said i had a bad inverter and unhooked it. Now two days later the truck i used to jump my truck has a bad inverter. I never reversed the polarity of the batterys or caused a short of any kind with the cables when i jumped it( although i cannot testify to what the people from the shop did). My question is this: is seems to be too coincidental that the attempt to jump start did not have something to do with the inverters going bad. Are there precautions that must be taken before jumping a truck with an inverter installed? Someone mentioned to me that the internationals have a battery setup that was preventing me from jump starting effectively...anyone know anything on this subject?

 

Inverters on both trucks were in fact off, I guess i was curious if they needed to be isolated or anything. I am not 100% confident that either inverter was installed correctly. This may be a factor. I would imagine there should be fuses in line with the inverter somewhere to prevent frying it..

 

No they were not same brand/model, I am not sure about the brand in the other truck but they were both 3000w 6000w peak. The one in my truck is branded as "Durified", installed used and not an electrical/electronics brand i am familiar with as far as reputation and quality. so i am inclined to agree. I suspect that possibly poor installs (done by the same installer) contribute to the problem.. thank you for your feedback on the issue I just wanted to make sure i am not missing something.