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8 & 10 cyl Bristol cars Type 407 onwards - restoration, repair, maintenance etc

Neutral gear safety switch

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  #1 (permalink)  
Old 30-03-24, 07:09 PM
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Thanks for your reply David, yes it sounds like I may need to make a slight adjustments on the linkages.

My concern now is, if I try and tweak any of the linkages, I may make matters worse.

As my car is currently running so well, I am inclined to leave everything as is for the time being and look at it again in the not too distant future.

Brian
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Old 30-03-24, 07:11 PM
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Quote:
Originally Posted by DODD View Post
Thanks for your reply David, yes it sounds like I may need to make a slight adjustments on the linkages.

My concern now is, if I try and tweak any of the linkages, I may make matters worse.

As my car is currently running so well, I am inclined to leave everything as is for the time being and look at it again in the not too distant future.

Brian
I had exactly the same concerns and reached the same conclusion and have left it alone for now too!

David
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Old 30-03-24, 08:23 PM
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The neutral and park safety switch provides a path to earth from the starter solenoid. A white and brown cable runs between the starter solenoid and the safety switch. Either the safety switch has become permanently shorted or the solenoid has found another path to earth or the gear selector is not operating the switch as intended. The first course of action would be to remove the white and brown cable from the solenoid and test continuity to earth with a multimeter with the gear lever in all positions. It should only have continuity in neutral and park.
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Old 30-03-24, 08:28 PM
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Quote:
Originally Posted by David C View Post
The neutral and park safety switch provides a path to earth from the starter solenoid. A white and brown cable runs between the starter solenoid and the safety switch. Either the safety switch has become permanently shorted or the solenoid has found another path to earth. The first course of action would be to remove the white and brown cable from the solenoid and test continuity to earth with a multimeter with the gear lever in all positions. It should only have continuity in neutral and park.
David,

If the safety switch was permanently shorted or the solenoid had another path to earth, wouldn't Brian's car start in 1st 2nd and Reverse too?

David
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Old 30-03-24, 08:33 PM
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Sorry - didn't read carefully enough. You are quite right. It looks as though the mechanism is either worn or out of alignment and operating the switch when it shouldn't.
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