Question about 1987 Porsche 944

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1987 Porsche 944...Hi again. Well I'm still working on getting up and running. Had it running after replaceing the starter, altenator, ignition switch...but the battery keeps draining. It was suggested that bench test the alternator...did that...it passed. Sooo..now what? Last suggestion was to check the battery light on the key switch, ie; if that is faulty to the alternaot then the al would not charge the battery. Now I just need instructins and possibly diagram of what and how to do the checking. Including if one of the harness wires is shorting. As specific as possible would be greatly appreciated. Thanks a bunch you guys.

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  • laura_belle0 Aug 19, 2010

    I will follow the advice about checking the alternator via the battery using the direct route. However, I still believe that the connection from the turn key/battery light to the altenator is the real problem..ie; no signal to let altanator start charging. I need to find the source of power loss. Needing more specific detaila as to how to check the connections is what I need. The repair manual I have is very generic and does not give me the detail of wiring in the harnesses to check for the problem wiring. Thanks

  • laura_belle0 Aug 19, 2010

    Going to follow this solution. I will get back to you on the result. Thanks. Hopefully this is the issue.

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Hi,

Is your volt light working?

If this is not working then check the bulb, if this is ok then earth the D+/61 terminal off the alternator.
If your light works then the fault is the alternator, if it still does not work then check the following:
1. Check that the fuse is ok for the charge lamp.
2. Check the blue wire from the alternator to the firewall connector for continuity. If this is ok the check from the firewall connector terminal for the alternator lamp to the connector behind the dash. If this is ok then you have a problem with the dashboard circuit, or if you found no continuity between the connectors to the alternator then you got a broken wire some where between them.

Hope this helped. Let me know if you need more information.

Thanks

Jason

Posted on Aug 19, 2010

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Instead of following all that, why not just put a jumper from the charge post of the alternator over to the battery positive, and see if the issue continues?

Normally, a draining battery is because there is either a dead short or a disconnected ground somewhere.

First check should always be all the ground wires on the chassis/engine/battery. Ensure they are clean and not corroded, and that they are connected and making good contact to clean metal.

Another test to see if the alternator is charging is to remove the positive battery cable from the battery while the engine is running. If the engine stops immediately, the alternator isn't charging. If the engine starts running rough, but continues to run, or just runs fine, then the alternator is charging.

Posted on Aug 19, 2010

  • Christ Pettitt Aug 19, 2010

    If the alternator I'm looking at is like yours, it has 3 wires on it. I can't tell exactly which one it is, but either the one that uses a spade connector, or the smaller of the bolt-on wires will be the one that controls the lamp illumination in the dash panel.


    Really, the only two wires you should need are the two bolt ons. The lamp is an optional feature that doesn't control the ability to charge the battery. The other two are charge (B+) and field, as far as I can tell.








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