Pushbutton Switch for Starter
Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=39467
Printed Date: May 06, 2024 at 6:09 AM
Topic: Pushbutton Switch for Starter
Posted By: Jlocke
Subject: Pushbutton Switch for Starter
Date Posted: September 21, 2004 at 6:58 AM
Could someone please show me how to wire up a pushbutton switch for my starter. I have a relay and a momentary switch, but I have no idea how to use the relay.
My ignition switch is so worn out it will not go to the "start" position, but it will switch on the ignition etc, so to save a couple hundred bucks I figured I would just put in a start button>
Thanks in advance and I apologise if this topic is a frequent one, I did read 14 pages and could not find the info I am after.
Jeremy.
Replies:
Posted By: hotwaterwizard
Date Posted: September 23, 2004 at 10:40 PM
What Kind of Car? Will you be able to turn the key to the on position or not? What kind of Starter do you have? [1] Built in Solenoid [2] External Solenoid ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: hotwaterwizard
Date Posted: September 23, 2004 at 11:19 PM
Here is a Hookup for a Ford. 
------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: Jlocke
Date Posted: September 25, 2004 at 3:40 AM
Thanks for the replies.
In answer to the question
- I can turn the ignition to on, the start function does not operate. This also unlocks the steering.
- The car is an old 318i BMW. 1984.
- It has an external solenoid
I would also like the pushbutton switch to be inoperable after the car has started. To reingage the start button it should be necessary to turn off the ingnition and then turn it on again. This is a std safety feature that is built into the ignition switch, but the diagram above would allow me to be able to ingage the starter any time the ignition is on, even when the car is already running.
Thanks again.
Posted By: hotwaterwizard
Date Posted: September 27, 2004 at 7:32 AM
Can you find a 12v power source that is only available when the Car is running. Measure the volts to the Coil or the voltage Regulator input and see how many volts we are dealing with. It could be 24vac instead of 12vdc. If you can find a power source we can add an extra relay to disable the push button. ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: hotwaterwizard
Date Posted: September 27, 2004 at 9:09 PM
Although I don't have your Answer right now, I have been serching the web for any details about your wiring that I could. I came across some info that may be useful to you. I thought you may want to take a look at the treasures that I found on your car. 84 BMW 318i series 3
Online Haynes Repair Manual https://dl.bmworg.ru/book/haynes/ Wiring Diagram https://dl.bmworg.ru/book/haynes/3&5_12.pdf Recalls for your car https://www.alldata.com/TSB/06/84062605.html E320i Wiring Diagram 
------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: hotwaterwizard
Date Posted: October 04, 2004 at 11:13 PM
Does your BMW have a Charge Indicator Lamp?
-------------
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: hotwaterwizard
Date Posted: October 04, 2004 at 11:22 PM
IF So Here is a Revised Diagram With the safety Disable Installed.  ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: hotwaterwizard
Date Posted: October 04, 2004 at 11:36 PM
Here is a Simplified View showing only the wires you need to deal with. 
------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: hemidakota
Date Posted: October 15, 2004 at 11:08 AM
I have a question regarding adding another route to the starter for a 1992 Suzuki Swift 1.3 DOHC GT model. The MK2 model had some engineering flaw with the ignition switch, cooper plates that were made too soft. Over a given period of time, the point would become worn down and contact or voltage would drop below the tollerance level to send power to the solenoid. Now it is doing the 'clicky click' from time-to-time. I want to add a relay or another route for power source to the solenoid by using a relay. is the first diagram ok for this car? I still want to use the key or ignition. I have a external solenoid
Posted By: hotwaterwizard
Date Posted: October 15, 2004 at 5:35 PM
Yes or you could omit the Relay and buy a push switch at the Auto parts store and a fuse holder.
 ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: hemidakota
Date Posted: October 18, 2004 at 8:10 AM
Works great now. Thanks. The next problem is that the door acutator are now not working. I have a Code Alarm Elite 2000 and look at the site's relay information and relay use with keyless entry with the 4-wire dual relays to see if the relays were bad. The ohms between 30 & 87A is 80 ish rang while the 86 to 85 is .02. One of the locks is stuck in the open position (passenger door). There is no ignition kill and has the one sensor. Any thoughts?
Posted By: hotwaterwizard
Date Posted: October 18, 2004 at 6:16 PM
The only thing I can tell you about that is. Disconnect the hot and Ground from the Relay and Actuate it with 12v that you know are Good Like from another battery that is 12v. Test the Relay and see if it is good or not. Then trace the wires back to your original source of power until you find the bad part. Usually a fusable link. ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: hemidakota
Date Posted: October 19, 2004 at 8:11 AM
Thanks
Posted By: Chouby
Date Posted: October 19, 2004 at 7:38 PM
For the push button for starter.. go under de steering and cut the starter wire.. "this is the wire you need to find" :) that's all :) Chouby 8)
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