our '82 300 SD still wont start. when the key is turned to pre start the glow plug light on the dash does not come on at all, but i am getting 11.37 volts exactly at all 5 glow plugs for around 20-25 seconds. is it fair to assume that the relay is working properly? however, when i disconnect the 5-pin plug from the relay (that runs from the relay to the glow plugs) the the glow plug light on the dash works properly (obviously, the glow plugs do not). could this be related to the not starting problem or should i ignore it? i am going to change out the fuel filters and bleed the fuel system for air. is there something else i should be doing but am overlooking?