Group 37 Wiring diagram FH Example of wiring diagram Component wiring diagram title, variant/subtitle and symbol. Coordinates (B 1). 30 Voltage battery, kl.30. 15 Voltage with starter key in drive position, kl.15. DR Voltage with starter key in drive position, preheat position and start position, kl.DR. 61 Voltage when alternator charges, kl.61. Splice. Fuse. Reference arrow, for diagram BA, coordinates 0 C, component A17, connector PA pin 29. 2