Headlights fluctuate!

B

Brithos

Member

Posts

24

Location

Surrey

• Jan 9, 2011

• #1

As per usual there is a problem with my landy! Whilst driving my headlights will randomly brighten or dim (not dangerously). It has absolutly nothing to do with RPM or anything like that. It also happens in full and dipped beams. Any help would be great, this has really got me puzzled!

Thanks

Jason

 

sierrafery

Well-Known Member

Posts

17,910

Location

Arad/Romania

• Jan 9, 2011

• #2

It's a loosened contact/earth somewhere

 

oldskool

Well-Known Member

Posts

3,116

Location

Essex near maldon

• Jan 9, 2011

• #3

Check ya alternator out put, my old sierra does that, volt meter on battery and watch read out mine can peak at anything up to 18v then goes back to normal, makes my head lights realy bright at night

 

The Mad Hat Man

Well-Known Member

LZIR Despatch Agent

Posts

83,296

Location

Embasinga stocæ

• Jan 9, 2011

• #4

oldskool said:

Check ya alternator out put, my old sierra does that, volt meter on battery and watch read out mine can peak at anything up to 18v then goes back to normal, makes my head lights realy bright at night

Click to expand...

****s yo battery QuickTime tho.
Alternator needs a new regulator - £5

 

mystery

Well-Known Member

Posts

1,510

Location

BULKINGTON

• Jan 9, 2011

• #5

sounds like the slip rings on the alternator are very worn or the brushes are low causing voltage to spike

 

oldskool

Well-Known Member

Posts

3,116

Location

Essex near maldon

• Jan 9, 2011

• #6

mystery said:

sounds like the slip rings on the alternator are very worn or the brushes are low causing voltage to spike

Click to expand...

More like the voltage stabilizer in the diode pack, brushes or slip rings are more likly to cause low voltage