Circuit breaker on ignition switch? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-14-2012, 03:36 AM
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Circuit breaker on ignition switch?

Is it a circuit breaker on the ignition switch in the GM steering column?
The column is from a '90 model Chevy Astro.

The wiring kit is from EZ wiring.

When I try starting the car, the ignition goes dead, and I suspect there is something wrong with the starter solenoid.
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Old 10-14-2012, 04:56 AM
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It could be the NSS (Netural Safety Switch). There is no breaker that I know of, in the column. The actual switch could be out of adjustment....... is your the switch mounted on the lower portion of the column?

If so the switch might be out of phase with the key/rod mech. Unbolt it from the column and insert a small screwdriver into the slot on the switch and see if it still goes dead, if it works properly then the switch needs adjusted to the key/rod mech, bolt it back on and find the sweet spot.
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Old 10-14-2012, 06:08 AM
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I don't use the neutral safety switch. The car has manual transmission.
When I wait for a while the ignition works again.
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Old 10-14-2012, 06:33 AM
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There is no circuit breaker that I know of in the ignition circuit.

If the '90 column is the same as the older models, there is a rack and rod mechanism that connects the key mechanism to the electrical connections mounted lower on the column (in the same place the NSS would be mounted). This is the Advance Auto Parts listing for the item Buy Dorman - Help Ignition Switch Kit - Chrysler/GM with Tilt Wheel 83211 at Advance Auto Parts

When you turn the key it moves a toothed wheel and small rack (square metal loop with teeth on one side), which then pulls up on a small metal rod. The other end of that rod is connected to the electrical switch mounted on the lower column. The "rack" is made of cheap pot metal and they often fracture and stop moving the rod correctly. If the rod does not move smoothly you get very unpredictable ignition switch actuation.

The replacement rack is only about $10-12US (sold under the Help! and Dorman parts, or directly from GM), but time-consuming to replace. You have to remove the steering wheel and strip down the upper part of the column until you can remove and replace the rack.

Bruce
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Old 10-14-2012, 07:36 AM
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Is it possible to just delete this thread.......
I hadn't torqued down the positive battery clamp enough.

But thanks for your time anyway!
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