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greig coutts

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  • From
    wisbech uk
  • Porsche Club
    No
  • Present cars
    997.1 3.8S
    vw touareg V10
  • Future cars
    Jaguar XKR
  • Former cars
    996.2 Carrera
    Xjr, Vauxhall monaro, porsche 928 Gt, Porsche 928 S2

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  1. greig coutts
    Thank you for the info on the wire to the alternator, I will do a voltage drop check on the wire from the gearbox terminal to the battery as I have already replaced the wiring in the engine compartment. As I said, I replaced the alternator but the new one has the same fault code appearing
  2. greig coutts
    Thank you for your suggestions, based on my research on the problems experienced I replaced the wiring harness from the alternator to the starter motor and through to the connection point by the gearbox.( my starting has never been a problem and the starter does not sound laboured) I thoroughly cleaned the connections and all seemed well but the fault is still there. Because it almost seems to switch on and off stopping the alternator charging I think it must be to do with the charging circuit. Question:Where does the other wire connected to the rear of the alternator come from, is it a positive feed or an earthing function, presumably it has to be activated for the alternator to start charging ?
  3. greig coutts
    I thought it was an alternator fault originally so I have fitted a reconditioned replacement alternator and the car still shows exactly the same fault with the new alternator fitted.When the fault code appears the voltage drops but it disappears after a few seconds and the voltage returns to over 14 volts. If I switch everything on, lights, rear screen heater, air con, stereo, etc it will maintain the correct voltage at tick over so I think the alternator is fine. The problem seems to be with the energising of the charging circuit, maybe the ignition switch, a relay or a loose connection. Hoping somebody has solved a similar problem. Thank you anyway
  4. greig coutts
    Have an intermittent battery / alternator warning light, so far fitted new battery changed alternator to starter wiring loom, fitted rebuilt alternator all to no avail. Have checked voltage whilst driving and when the warning comes on the voltage is dropping so the sensor is correct the voltage drops to around 12.8 and then usually the light goes out and the voltage goes back up to above 14 volts. So it would appear to be a connection fault but where do I start to look The car starts fine and once warm it will suddenly come up with fault warning which will then continue to reappear at random so to my thinking it must be linked to the charge circuit maybe a relay or a switch contact . Any ideas or checks welcomed
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