Jump to content


FirebirdNation.com is the premier Pontiac Firebird forum on the internet. Supporting Members do not see the above ads.
Photo
- - - - -

2nd Gen - Engine Immobilizer Switch


  • Please log in to reply
9 replies to this topic

#1 bowlingbrad

bowlingbrad

    Firebird Oil Changer

  • Full Member
  • PipPipPip
  • 103 posts
  • Gender:Male
  • First Name:Brad
  • City:Brookfield
  • State or Province:IL
  • Country:USA
  • Year: 1978
  • Make: Pontiac
  • Model: Firebird Trans Am
  • Engine: 8cyl
  • Transmission: Auto

Posted 2 weeks ago

Hello,

I know there are 1,000,000 ways to put a kill switch in our vehicles but I've chosen this method and was hoping that I could get some verification/input from the Nation.

 

I've chosen to go with a grounded switch relay option per the attached bosch diagram.  I'm assuming that since my 1978 TA has a stock HEI setup, the wires to/from the coil would simply be the wires to/from the HEI.  If anyone has anything to add/change, I would appreciate it.  I just don't want to blow anything up because I chose the incorrect wires.  Wire colors, etc. would get me going in the right direction.  I will be using my wiring diagram as a starting point for clarification as well.

 

Thanks in advance!

 

 

Attached Files



#2 Formula71

Formula71

    Garage Gopher

  • Administrator
  • 3,930 posts
  • Gender:Female
  • First Name:Layna
  • City:Omaha
  • State or Province:NE
  • Country:USA
  • Interests:hummmmmm, cars? lol
  • Year: 1971
  • Make: Pontiac
  • Model: Formula Firebird
  • Engine: 400
  • Transmission: M22 "Rock Crusher" 4 Spd

Posted 2 weeks ago

Message me. I'm interested in how/where you are putting your hidden switch.




RIP Jay - So glad to have known you

#3 bowlingbrad

bowlingbrad

    Firebird Oil Changer

  • Full Member
  • PipPipPip
  • 103 posts
  • Gender:Male
  • First Name:Brad
  • City:Brookfield
  • State or Province:IL
  • Country:USA
  • Year: 1978
  • Make: Pontiac
  • Model: Firebird Trans Am
  • Engine: 8cyl
  • Transmission: Auto

Posted 2 weeks ago

Message me. I'm interested in how/where you are putting your hidden switch.

Joke, right?



#4 Formula71

Formula71

    Garage Gopher

  • Administrator
  • 3,930 posts
  • Gender:Female
  • First Name:Layna
  • City:Omaha
  • State or Province:NE
  • Country:USA
  • Interests:hummmmmm, cars? lol
  • Year: 1971
  • Make: Pontiac
  • Model: Formula Firebird
  • Engine: 400
  • Transmission: M22 "Rock Crusher" 4 Spd

Posted 2 weeks ago

well, I didn't want you to post it here for the world to see. But I was looking for ideas myself.




RIP Jay - So glad to have known you

#5 bowlingbrad

bowlingbrad

    Firebird Oil Changer

  • Full Member
  • PipPipPip
  • 103 posts
  • Gender:Male
  • First Name:Brad
  • City:Brookfield
  • State or Province:IL
  • Country:USA
  • Year: 1978
  • Make: Pontiac
  • Model: Firebird Trans Am
  • Engine: 8cyl
  • Transmission: Auto

Posted 2 weeks ago

I'm not 100 per cent sure yet but I like a couple of the youtube videos that show very different ways.  I even saw one where you turn the key and press the horn. 



#6 bowlingbrad

bowlingbrad

    Firebird Oil Changer

  • Full Member
  • PipPipPip
  • 103 posts
  • Gender:Male
  • First Name:Brad
  • City:Brookfield
  • State or Province:IL
  • Country:USA
  • Year: 1978
  • Make: Pontiac
  • Model: Firebird Trans Am
  • Engine: 8cyl
  • Transmission: Auto

Posted 2 weeks ago

Here is my location assumption.  Please see the attached image.  I'm having trouble applying this option to the HEI.

 

1. Can I just splice the 30 - 87a terminals into the wire to the HEI?

2. What wire do I use to the 86 terminal?

3. The only thing I have matching the Bosch is the hidden switch from the 85 terminal to ground. ;)

 

I think I need to re-engineer this so the control side of the relay closes the link to the HEI wire.

 

:HmmHmm:

Attached Files


Edited by bowlingbrad, 2 weeks ago.


#7 bowlingbrad

bowlingbrad

    Firebird Oil Changer

  • Full Member
  • PipPipPip
  • 103 posts
  • Gender:Male
  • First Name:Brad
  • City:Brookfield
  • State or Province:IL
  • Country:USA
  • Year: 1978
  • Make: Pontiac
  • Model: Firebird Trans Am
  • Engine: 8cyl
  • Transmission: Auto

Posted 2 weeks ago

I think I got it.

 

1. Splice terminal 86 into accessory power from ignition switch.

2. Place hidden kill switch between terminal 85 and ground.

3. Intercept wire to HEI between terminals 87 and 30.

 

When ignition is turned on and the hidden switch is closed the relay will be triggered.

When relay is triggered, the HEI gets power enabling car to start.

 

Is using 40Amp relay enough?

 

Thoughts?

Attached Files


Edited by bowlingbrad, 2 weeks ago.


#8 JoePeek

JoePeek

    Firebird Master Tech.

  • Full Member
  • PipPipPipPipPipPipPip
  • 1,019 posts
  • Gender:Male
  • First Name:Joe
  • City:Westfield
  • State or Province:IN
  • Country:USA
  • Year: 1971
  • Make: Pontiac
  • Model: Trans Am
  • Engine: 455 HO
  • Transmission: 4 speed

Posted A week ago

Why use the relay? That is one way of doing it for sure, but you still have to have a hidden switch somewhere. That being said, why not just put a good quality, higher amp rated switch in series with the wire going to the coil? A much easier install, and you don't have to worry about the relay going bad and leaving you stranded. I know the ground path on the low side of the relay is less load on the switch, but a high rated direct switch would be more robust and reliable, less parts.


Edited by JoePeek, A week ago.


#9 bowlingbrad

bowlingbrad

    Firebird Oil Changer

  • Full Member
  • PipPipPip
  • 103 posts
  • Gender:Male
  • First Name:Brad
  • City:Brookfield
  • State or Province:IL
  • Country:USA
  • Year: 1978
  • Make: Pontiac
  • Model: Firebird Trans Am
  • Engine: 8cyl
  • Transmission: Auto

Posted A week ago

Why use the relay? That is one way of doing it for sure, but you still have to have a hidden switch somewhere. That being said, why not just put a good quality, higher amp rated switch in series with the wire going to the coil? A much easier install, and you don't have to worry about the relay going bad and leaving you stranded. I know the ground path on the low side of the relay is less load on the switch, but a high rated direct switch would be more robust and reliable, less parts.

 

Less parts/less work....I'm game with that!  Can you suggest a switch that may work?

 

Is this one good enough? 

https://www.amazon.c...Y0O/ref=sr_1_14


Edited by bowlingbrad, A week ago.


#10 bowlingbrad

bowlingbrad

    Firebird Oil Changer

  • Full Member
  • PipPipPip
  • 103 posts
  • Gender:Male
  • First Name:Brad
  • City:Brookfield
  • State or Province:IL
  • Country:USA
  • Year: 1978
  • Make: Pontiac
  • Model: Firebird Trans Am
  • Engine: 8cyl
  • Transmission: Auto

Posted 5 days ago

I got too scared to snip some wires so I'm putting it off for a few weeks.  I don't NEED this right away so I'll just wait until a buddy of mine has time to walk me through it.






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users