Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
You can do a quick and dirty test by putting a jump lead from battery negative terminal straight to the sump plug to give you earth bypass and see if it improves.Cars, I always fit two separate earth leads to make sure it's got redundancy from running a rally car, if one gets snagged or compromised it'll still start.