Hi , I have made a major schoolboy error, after fitting a new EGR, I decided to replace the battery too. I did not see that the polarity on the new battery was reversed. I took it for granted that it was same as old one. (shame) When I connected the Earth / Ground black connector to what I thought was Negative, it started sparking and wiring started smoking at loom above starter motor, where 2/3 wires all branch together. I quickly realised something bad was happening so quickly disconnected the battery, and re-fitted the older battery. The central locking is not working, radio, heater fan not working, heated seats not working, rear wash/wipe, N/S 12v outlet not working but O/S is working. Lights/horn/indicators/dials(after dial dance) all working. Had a look at a few fuses and they "look" okay. Swapped rear blower relay with accessories relay, but still same. Can anyone suggest which relay or fuses to check for basically all the central dash switches ?? If I can find a relay or fuse to change, then that would save me having to investigate the wiring loom until last. 2007 stow n go grand voyager. Gutted and angry at myself. Basics. Thanks, fingers crossed P.S. car started fine and runs, and after clearing code P0402,no more engine light.