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Registered
Join Date: Jul 2001
Location: Powell, Ohio
Posts: 24
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No power to spark box!
I have a 83 911 that is having intermittent ignition problems. I have narrowed the problem down to power not getting to the CDI box. I have replaced the ignition switch (along with a lot of other parts that were not part of the problem!). Anybody have experience with this? Any suggestions on where to start looking for the shorted wire?
Thanks! |
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10-07-2001, 10:51 AM
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Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Darren,
This type of problem is the clearest example of the failure of the 'current-flow' diagrams used by the factory since 1974 to convey where in the vehicle parts and wires are located! I will use both the '82 current-flow diagram and the 1973 diagram from Pelican to try to simplifythe troubleshooting. I can't say I have traced the wiring of an SC relay/CDI/fuse panel, but I have on earlier cars and feel there is close 'family' ties in the history of the 911 to state that few changes in the history of CDI-unit wiring on that panel since 1969. With the above premise, I refer you to the two 14-pin connectors in the two following diagrams. The first diagram is a 1973 CIS car, and the two 14-pin connectors are located side-by-side to the left of circled identifier #84. The leftmost (forward on the panel) 14-pin connector connects to the body wiring harness. The rightmost (rearward on the panel) 14-pin connector connects to the engine wiring harness. In the lower '82 SC diagram, there is a connector labeled 'T2a' that corresponds to an unlabeled connector on the red power lead near the #9 CDI-unit in the '73 diagram ... that is a 'pigtail lead' coming off the #2 pin of the forward connector, and goes into the main harness coming directly off the engine from distributor and coil into the three or six-pin connector on the underside of the CDI-unit. My suggestion at this point is to remove the relay/fuse/CDI panel from the engine compartment and examine the 14-pin connectors, and the power lead pigtail into the harness for the 6-pin connector for the CDI-unit.   ------------------ Warren Hall 1973 911S Targa 1992 Dodge Dakota 5.2 4X4 parts hauler |
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10-07-2001, 01:03 PM
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