'91 Coupe Quattro headlights out

[Mark Rosenkrantz]

You must mean "including" ground, correct?  If so, disconnect the socket from the bulb and recheck.  You most likely have a bad ground.  Next would be corroded wire, next relay.  Why are you getting +12V and the bulbs not working?  Because a multimeter is very sensitive, but without sufficient current available, the bulbs won't illuminate fully.  Old VW wiring (like the fusible links) was famous for having corrosion up inside the wiring-moisture would literally wick up the wire since the jacket was not bonded to the wire strands.

Mark Rosenkrantz
Typos sent from my iPad

On Mar 3, 2013, at 12:44 AM, wadd-wadd at usa.net wrote:

> The headlights of my CQ do not come on. I have been running relayed headlight
> harness with euro lights for 20 years. 
> 
> When I check the voltage at the 3 wires that go to the H4 bulb, I am getting
> 12V at all wires injuring ground. I am baffled. What's causing this, the
> headlight switch?
> 
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