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dmetzler

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    Louisvile, CO
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  • Present cars
    1999 Porsche 996

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  1. Power flow : battery-> ignition switch -> relay -> starter solenoid. You have a break somewhere along the line. Try this. Remove the relay and see if you get 12v on pin 30 on the relay socket when you turn the key to crank. If you don't, it's likely your ignition switch is bad. If you do get 12v, it's likely your relay is bad. To verify, check continuity between pin 30 and 87 of the relay. They should close when the relay is energized. If that checks out, you may have a wiring issue between the relay and the starter solenoid (much less likely). If the relay is bad, you can temporarily put a short and fat jumper (awg16 or thicker) between pin 30 and 87 of the relay socket to start the car. A thin jumper will not work as the solenoid needs 30~40A to operate. Tested the above. No +12v on pin 30 of the relay socket. Does that make it the starter switch? What if the battery does not have enough amps? It was tested at NAPA at 750CCA, but the headlights are dim. I replaced the starter switch only two weeks ago. Thanks, -Don No 12v on pin 30 when you turn the key to crank, meaning 0v right? If yes, then your ignition switch or the wiring between the ignition switch and pin 30 has a break. The former is much more likely. By starter switch, do you mean ignition switch? If so, it's also the last thing touched... A weak battery may not be able to energize the solenoid but at least you should get some voltage on pin 30. Correct - 0v on pin 30. Yes, the ignition switch. I replaced the switch a week ago Sunday, then took it out for a drive. Started successfully all day. Went to start the next morning, turned the key, gauges and dash lights came on but no start. (Switch was replaced because previous switched was broken when someone at the emissions testing overcranked to try and turn off the car.)
  2. Power flow : battery-> ignition switch -> relay -> starter solenoid. You have a break somewhere along the line. Try this. Remove the relay and see if you get 12v on pin 30 on the relay socket when you turn the key to crank. If you don't, it's likely your ignition switch is bad. If you do get 12v, it's likely your relay is bad. To verify, check continuity between pin 30 and 87 of the relay. They should close when the relay is energized. If that checks out, you may have a wiring issue between the relay and the starter solenoid (much less likely). If the relay is bad, you can temporarily put a short and fat jumper (awg16 or thicker) between pin 30 and 87 of the relay socket to start the car. A thin jumper will not work as the solenoid needs 30~40A to operate. Tested the above. No +12v on pin 30 of the relay socket. Does that make it the starter switch? What if the battery does not have enough amps? It was tested at NAPA at 750CCA, but the headlights are dim. I replaced the starter switch only two weeks ago. Thanks, -Don
  3. Has this been resolved? I am having a similar issue with my 1999 996. Starter relay clicks but no start. (I tested the relay with 9v battery - it energizes.) I disassembled the component to get to the starter and tested - not getting 12v to starter when the key is turned. Any info appreciated. Thanks, -Don
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