Yes with careful plan. Don'ts: -connect direct with or without fuse in series. -relay the charge through the chassis. Do's: -with a series resistor or equivalent(12V15A bulb) to batt+ve cable. -with batt+ve and -ve cables to relay the charge.(add safety margin from spark) --------------hope that help _YK ----- Original Message ----- From: Jim Monaco <[EMAIL PROTECTED]> To: Listserver Soaring <[EMAIL PROTECTED]> Sent: Tuesday, May 01, 2001 9:42 AM Subject: [RCSE] Auto Battery Charging? : This may be a dumb question, but here goes. I have a small tractor battery : that I keep in the back of my SUV for quick charging planes and radios - : plus my zagi batteries. I happen to have a power outlet (lighter type) : right next to the storage place for the battery. Is it possible to connect : the power outlet to the battery to recharge the tractor battery from the : power outlet while I am driving? Do I need some special adapter or circuit : to regulate the charging? If not - how about a separate cable running from : the Battery + to the back of the vehicle - then a ground cable to the frame : in the back. Will the alternator then put out whatever is necessary to : charge the additional battery? : : Thanks, Jim : Rocky Mountain Soaring Association : : : : RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]