On your CCU press and hold REST for 5 secs to get into diagnositc mode, then use left or right AUTO buttons and toggle to screen 24. Thats your battery voltage. Should be +13 volts while driving.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)