Dash Alt-light Wong go off (1 Viewer)

starbar2

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Nov 13, 2020
2
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A year with a motorhome
05 Cayman dash light and buzzer on intermittently. Replaced new alternator & belt plus new house and chassis batteries but that did not resolve dash light issue. Need some ... ideas....
 
Aug 4, 2019
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North East Riviera
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62,993
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Low profile
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Enough to Survive
Have you checked the voltage at the starter battery with a multimeter to see if the alternator charge is actually getting to the battery?
 
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starbar2

Free Member
Nov 13, 2020
2
0
Funster No
77,733
MH
Class A
Exp
A year with a motorhome
Yes everything is charging*
 
Jan 28, 2008
10,104
18,260
Dovercourt, Harwich, UK
Funster No
1,353
MH
Renalt burstner
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7 years campers before that
playing parts darts is an expensive game you need to find what the problem is multi meter is the best way your hab batteries are unlikley to cause this have you checked the earth straps connections etc
 

pappajohn

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Aug 26, 2007
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Since 2005
Have you tried an OBD reader.
There should be a stored fault and may need clearing before the light extinguishes.

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Jan 28, 2008
10,104
18,260
Dovercourt, Harwich, UK
Funster No
1,353
MH
Renalt burstner
Exp
7 years campers before that
if everything is charging it must be a fault in the light circuit its self not sure if at that age it direct or via the ecu
they used to work by when the ignition comes on there is a live to the light which earths down through the alternator once the vehicle starts then 12 is delivered to that wire and because both side are 12v the light goes out
 
Jul 12, 2013
3,853
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The City of Henlow
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26,906
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Adria Supreme
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Since 1980
Without a full understanding of your problem, it would seem that there is a power leak. Rather like poor earths on older cars when lights could stay on, even when everything was turned off. I am thinking that at 15 tears old, such things can occur.
 

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