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Registered
Join Date: Jun 2002
Location: Belgium
Posts: 94
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Alternator check-up
Needed to change CDI box and coil last weekend.
Duno what made the CDI box fry. maybe the coil, measurements are OK and putting the old coil back for testing could kill my new CDI  A frend told me that an alternator giving to much voltage can also fry your CDI, so I might need to change the alternator or voltage regulator. Now the big (beginners) question: Where do I measure the alternator voltage and what am i supposed to measure?  Bart.
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911 rules! 1980 SC Targa Turbo Look 2002 BMW 525d |
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08-29-2002, 01:21 PM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,500
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Get a multi meter and check voltage at the battery. Car off: 12.5 volts. Car running at 1000 rpm: 13.5-14 volts. Anything over 14 volts is overcharging.
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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08-29-2002, 01:33 PM
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Senior Member
Join Date: Apr 2001
Location: Finland
Posts: 1,214
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The CDI-box can take at least 17V DC and it will do just fine.
3 pin cdi box has these pins: 5/450V triggered output 12V power in Trigger pin (from the points) ground connection on the CDI chassis Soo..basically alternator has nothing to do with the frying...because, grounding 12V power would cause fuse blowing or melting wire, grounding trigger pin...well it is supposed to be grounded from time to time... and 5/450V triggered output creates a high voltage arc to coil...well this being grounded could cause some damage... well...This is just me talking |
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08-29-2002, 10:34 PM
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Registered
Join Date: Jun 2002
Location: Belgium
Posts: 94
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Thanks guys,
Battery charging measures up. It musta been the coil, especially with the black puss that came out and messed up my nice chiny distributor cap  Bart. 
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911 rules! 1980 SC Targa Turbo Look 2002 BMW 525d |
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08-30-2002, 07:12 AM
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