Logo
FULL SITE MENU

Thunderbolt V and the interuptor switch

kghost

kghost

Silver Medal Contributor
Working on a friends 5.7 1997 4bbl with thunderbolt V (NO KNOCK SENSOR). Alpha 1 Gen II

One of the white with green stripe wire coming from the module connector is the one that goes to the shift interrupter switch.

He says when the switch is connected properly that the motor will not start and if disconnected and the mater is started and is running once reconnected while running the motor runs terrible.


Has anyone experienced this condition and if so what where your findings?

So far all I have confirmed is the interrupter switch is working properly using a digital ohm meter. It is open as it should be and closes when the arm is moved. (Old style interrupter switch with long arm and roller)

I have not checked the wiring harness yet for possible shorts but could this be a sign of a faulty timing module?
 
If I had to guess the wires are reversed on the connector block. one screw is used to hold the block in place and supplies the ground connection,the other is isolated and takes the green/white wire
 
Not on this set up. It appears they did away with the mounting block just before the new design came out.....
The schematic shows this for the 1997 model

the switch blots directly to the shift bracket and the ground is thru the harness as is the white with green stripe connecting to the switch.
 
Sounds like the "logic" for the interrupter switch is reversed. Is this a new problem or did it always do this? Sounds to me as if he is connecting stuff up that there was a recent repair/replacement????
 
Yes I might agree except this is straight forward.........the green with white stripe wire coming from the module to the ignition pick up Also goes to the interrupter switch. When the switch is made it shorts the ignition pick up to ground.

Simple............Or so one would think.......

Have not been back over to check stuff or swap timing modules..........Possibly this weekend.
 
Back
Top