|I spoke with Steve Newton at Clive Wheatley this afternoon and he says they have been trying to resource the relay but it is NLA at present, but they are trying to find a way to find some through their contacts. Steve said that when they have met the problem of a faulty relay which leaves the interior light on and without a replacement relay, they have bypassed the faulty relay with a loop of wiring as a patch lead. Then the lights go on and off but there is no buzzer or delay. He has examined one of the relays and it has a miniature printed circuit inside so is likely to be an expensive item to get remade and a minimum economic run is likely to be a 1,000 or more.
One idea I raised with Steve is whether a relay from another car which performs a similar function on the interior light facilities could be used, providing a delay in extinguishing the light and then a dimming as they turn off and possibly a buzzer too? If one can be identified from say an Audi, BMW or another model with that feature then it's very likely it would not fit as a direct replacement so a patch lead arrangement to wire it in might be needed. I have left a message with Bob Owen, a fellow member who is a professional electronics engineer, to see if he could review the options.
So John, if you want more information on how to overcome the "interior lights remaining on" problem I feel the easiest way is to call Steve Newton at Clive Wheatley mgv8parts or arrange to pop your RV8 in at their workshops to have the fix carried out. If you have a good local autoelectrics specialist then they may be able to do the fix for you.