1978 Mack Wire Diagram. It looks like you lost power between the dimmer switch and the headlamps. Owner domaindocument prefix document no issue index volume no page no.
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Submitted april 22 2010.
It looks like you lost power between the dimmer switch and the headlamps. Check out our popular mg mgb manuals below. Power to the dimmer switch comes from the dash switch via 14bn g. Updated june 20 2016.