Please fill out the following to ask a question. MAKE:Ford MODEL:e 350 YEAR:1998 MILES:??? ENGINE:7.3l DESCRIBE ISSUE.... This one I need help with. The ambulance is now reinvented for a mobile mechanic truck. Frame rail battery is non existent as it was converted to an ambo. There is a slide out tray for the Vanner isolator and invertor which are still there and AC/DC equipment which are no longer needed and has been long since removed but all high current and low current cables are right there and the isolator looks great. But the only cables I have going to the tray for the batteries are chassis ground so my meter says. This was a job I inherited the other day and I am lost as I have never delved into ambo conversion systems before, but I have done some research and now I am confused after doing some volt meter tests. I will take picture tomorrow if I can, but will try to describe my issue here anyway with my shyte french to english. So, the old ambo was pulled out of a snow bank after having sat there for many years. Someone removed the auxiliary battery system and tried to start the engine. No go. They came to me and asked for a new starter which I ordered for them, which THEY installed. No start, just click. Ok, I said bring it to me and I will take over. I first noticed a new battery. It was for a small truck/automobile and it was dead. So I charged it and bang the truck turned over in a new york minute once the glow plugs had chance to warm up. I told client, you need a deep cycle marine battery for an RV or something to that effect. So off he went. Three days later, (today) come back, says it doing the click thing again. Ok, I go out to where it's stalled, notice he still has the small CCA bat in there. So I try to jump it with the srvice truck which is only a f350 1995 with a 5.8l. No go, just click. So I dive into the puddle of mud and slush underneath to check for BAT+ on starter as I obviously know the relay is getting signal. At this point I go back and get a marine battery for RV and tractor. Now it turns over but smokes comes off my red bat+ jumper cable. I say, we are going to stop this before something melts. I think, either the main bat+ cable is way to resistive, or the new/rebuilt starter is defective. But I also want this ambo to go back to dual battery system, but the Vanner isolator and the way it is hooked up is leaving me perplexed. I should have two pos leads and just ground the aux 1 and aux 2 batteries to chassis. @ -30c this diesel will never start with only one battery, let alone a automotive one. What should I look for here in regards to the vanner isolator kit in place which looks and feel very professionally installed and I want to KEEP that setup for sure. First on my to do list tomorrow is to remove the bat+ and neg cables from battery to starter and chassis ground and either make new ones with 2 gauge wire for ground and 2 gauge for + starter wire/cable and order a new starter as I think he toasted that one. It must be drawing wicked amp to smoke my jumper cables that much. I know, I made them myself.