the relay contacts can stick together and burn the solenoid because of the sparks generated by the commutation we can use two 100nF (ceramic or plastic) capacitors to prevent sparks obviously one capacitor for each relay the capacitor must be connected like a bridge on the two switching contacts ceramic or plastic capacitors have no polarization Also the modification suggested by Elvis Nocita is surely necessary and useful To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/