Mark I concur with these other opinions, the emeter (Link-10) needs to have it's own separate DC-DC converter. The common negative with the pack and the 12V system is the problem. This is the one, hook it between the 12v aux. battery and the emeter, isolates the negative: http://store.evparts.com/shopping/product_details.php?id=&product_id=1540 Roy LeMeur Seattle WA Hm: roylemeur@hotmail.com Wrk: rlemeur@evparts.com EV Parts Inc. http://store.evparts.com 425 672 7977 EV Parts, your Electric Vehicle Parts Superstore My Electric Vehicle Pages: http://www.angelfire.com/ca4/renewables/evpage.html Informational Electric Vehicle Links: http://www.angelfire.com/ca4/renewables/evlinks.html _________________________________________________________________ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx