Thanks everyone for the help, but i dont think its anything to do with wiring or battery anything along them lines. Believe it or not, i think its too much sump sealer thats been used when someone's resealed the sump. The reason i know this is because i used too much on our demo GT last week and it was making the same noise after I'd resealed it and it was running fine before hand. I was just hoping it would be something else as I dont like removing sumps lol. If too much sump sealer is used it apparently affects the Oil pump? Something like that. Doesn't quite make sense to me but anyway thats what i think is wrong with it. So tomorrow afternoon once I've sealed the sump on our EP82 again this will be going back on to the ramp. I'll let you know how i get on Thanks again for all the help Aamir