I have checked my 300E ,because i had a problem with charging.
13.6v - with headlight and almost everything else on.
13.85v - with everything off.
I even tried to rev the engine but voltage is stable.
I have the ke-jetronic with the extra air pump wich compensates low rpm when additional load is on.
I have got a battery from optima "red top"
Pelle
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