1998 Volkswagen Polo revs die when headlights switched on

Car: Volkswagen Polo
Year: 1998
Variant: 1.9 sdi estate
Categories: Running Rough, Starting & Power Loss
my 1.9sdi polo estate revs die, even at speed, when I switch headlights on. Any ideas where to best start testing.
Posted: Aug 12, 2012 (11 years ago)
Check alternator output voltage and alternator earth strap for corrosion
Posted Aug 12, 2012 (11 years ago)
Any idea what output voltage should roughly be.
I didn't think it would be alternator because heater / heated screen doesn't seem to affect revs.
Posted Aug 12, 2012 (11 years ago)

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