I have a 1997 Nissan Maxima with 251k miles and I think I may need to clean my engine grounds but I do not know where the grounds are. Can any1 tell me where to find a diagram or DIY guide on how to clean my engine grounds??? I think I may need to replace them b/c Nissan said my ECU isn't getting the proper voltage and sometimes it takes a while to start and I think I may need to clean and add an upgraded engine grounds kit...what do you all think???