PLUSPOL WILL BE HELPING?!

Have a problem with my electric! Saturday before the week I went shopping with women in the evening and had both seat heaters and saw that the battery lamp glimmered! So stopped and measured briefly by the battery and there came 12,9-13,8v! Well so. measured again and there it was 14,1v! so thought lima in ass and a new order and installed today and measured with all consumers brought them 13,56V and I had to find that the PLUSPOL is getting warm to hot! Have the mass point un the battery compartment cleaned and screwed up again! Glimming in the stand was gone: I was happy that everything funzt and made me on the way home and on the way the seat heating was switched on and there the lamp smoldered again and when I switched on the rear disc heating for test purposes the lamp was still brighter but was not fully there! Besides, I noticed that the seat heating within seconds made itself felt! Where is my fault and there are photos somewhere where the mass might be. Is there any point in the matter?