Hi Jordan, I think the mod was required from 4xxx or something. It's on the DMCnews website. It sounds like you could benefit from an additional dedicated earth strap to the starter as Kevin recommends. I may have to start making these as we have a sponsor on the robot by the name of High Density Cables Ltd... Nuff said! Martin --- In doc-uk@xxxxxxxxxxxxxxx, "Jordan Morris" <jordan@xxxx> wrote: > Martin, > > Sorry I didn't reply sooner, things have been a little busy! I've had the battery tested and it seems to be fine. Do you think I could need a heavy duty one? My vin is 005783. Which mod is that? > > Thanks > > Jordan