Headlights dimming

[Looneyboy]

I have a 2001 Ford Maverick manual.

When i accelerate hard and the reves increase (ie joining a motorway from a slip etc) the headlights start to dim. The dont go out but they drop to around 50% power. They dont return to full power untill the revs drop to around 4,000.

ive checked the alternator and that appears to be fine.

Its strange because i could understand it if it was the other way around...

Anyone got any ideas ?????

Thanks

 

[^neo^]

Alternator would be the logical culprit. How did you check it?

 

[Willa]

Could be that when you rev up the belt is slightly loose and does not bite properly. ie. the wheel is going to fast for the belt. Had a similar problem on an escort and just tightened the belt.

 

[Looneyboy]

Neo.. My brother in law has something that measures the output from the alternator. He said that it appeared to be ok..

Willa.. Thanks ill look at that