986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Airbag cel- dead alternator?

Steve Tinker · 05-03-2011, 04:23 PM

Looking at your alternator ouput voltages, I think they are a little on the low side of being acceptable, but not enough to replace the alternator....

If you are concerned about the grounding, run a temporary cable from the negative side of the battery and bolt the other end of it securely to (say) an engine or transission bolt and then check your alternator output again. Any improvement in voltages will give you an indication of whether you have a high resistance grounding problem.

I would still look for another reason for the CEL though.......

05-03-2011, 04:23 PM	#3
Steve Tinker Registered User Join Date: Dec 2008 Location: Queensland, Australia Posts: 1,522	Looking at your alternator ouput voltages, I think they are a little on the low side of being acceptable, but not enough to replace the alternator.... If you are concerned about the grounding, run a temporary cable from the negative side of the battery and bolt the other end of it securely to (say) an engine or transission bolt and then check your alternator output again. Any improvement in voltages will give you an indication of whether you have a high resistance grounding problem. I would still look for another reason for the CEL though....... __________________ 2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley. 2001 MV Agusta F4.