Thanks for your reply. I did buy a new battery , connected it up and it works! I want to change the resistor because it may have changed value. I bought, and installed it in 2003, but I am not sure of the manufacturer, who is SL? I do have an electrical background, for many years I was a TV engineer, so I am not a novice on components but the physical size of resistors has changed over the years. this may be a safety resistor so I need to get the wattage correct.
Any info would be helpful.Thanks
Pete
May 2012