Hello together, we bought a VW T4, in which already half with the RV expansion started. Now is a second battery under the driver’s seat and I have two questions: 1. Maybe the question is quite stupid, but we are really bloody beginners: How can you find out if the battery has already been connected (correctly) to the engine? 2. Can you trust yourself as a beginner, build a socket to the second battery? And: Does someone know a good instruction or a Ti pp, how do I get a good guide? Thank you very much! LG, Bishuk