Thatsjustdandy

Member

• Apr 18, 2019

• #1

Hi all.

Got a problem with my series 3 SWB petrol. Only just bought it. The charging light stays on up to about 40mph, then goes out. Comes on again if I turn the headlights on or slow down. Could this just be dirty contacts on the connector on the alternator or is it more likely the alternator is clapped?

 

Bobsticle

De Villes Advocaat

• Apr 18, 2019

• #2

Sounds like it could be the alternator. You have checked the fan belt I take it.

 

Thatsjustdandy

Member

• Apr 19, 2019

• #3

Bobsticle said:

Sounds like it could be the alternator. You have checked the fan belt I take it.

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Yes, the belt is fine. I thought it was probably the alternator on its way out but will check the contacts. Did 35 miles like it yesterday but it started fine this morning. The alternator appears to be charging even though the light is on.

 

Bobsticle

De Villes Advocaat

• Apr 19, 2019

• #4

Just stick a multimeter on it whilst ticking over. Mine gives 14 volts when charging.

 

Thatsjustdandy

Member

• Apr 22, 2019

• #5

Just measured mine at tickover, 13.94V with the charging light on.

 

Bobsticle

De Villes Advocaat

• Apr 23, 2019

• #6

Try a length of cable from the light to the alternator to check the original isnt playing games.

 

wireman

Well-Known Member

• Apr 23, 2019

• #7

Bobsticle said:

Try a length of cable from the light to the alternator to check the original isnt playing games.

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It sounds like the wire from the alternator to the Charge Light is earthing out somewhere. As Bobsticle says run a new wire from the light to the alternator to see it that cures the problem and/or check the length of the original wire for chaffing etc.