Hi - I bought my son a 735i and sometimes it starts and sometimes it doesn't. We think that it is perhaps the safety neutral switch as we notice that the P on the dash do not always light up. My husband found a plug in under the hood where the relays go and thinks it may be a short in there, but we do not hve an owners manual or schmetics for the car so we are not sure exactly where that board (where the relays plug in) actually is located. It was just sitting by the firewall on my sons car. We are trying to locatee it so we can pull it from a junk yard but as I said we have no idea where it is actually located, can anyone tell us where we could find this board or perhaps does someone have the schematics tht we an look at and try and find the problem? Thank you so much for any help thqt you can give it is greatly appreciated!!!