why starter have 2 wires?
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=19858
Printed Date: May 19, 2024 at 12:20 AM
Topic: why starter have 2 wires?
Posted By: profuse007
Subject: why starter have 2 wires?
Date Posted: October 09, 2003 at 12:10 AM
why starter have 2 wires? why not just one? whats the functions of the two wires?
just curious of this thingy.....
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Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).
Replies:
Posted By: floaterr
Date Posted: October 09, 2003 at 7:45 AM
I know! I posted the same thing and never got an answer.
Posted By: sm951
Date Posted: October 09, 2003 at 8:44 AM
Having replaced all the cables in my car, let me try to pass on what I learned (which is not a whole lot): There is one positive cable that goes from the battery to the starter. Then from the starter, there's a positive cable that goes to the alternator. There is also a "trigger" or "exciter" wire that goes to the starter's solenoid from the ignition area (perhaps from the ignition switch?). I hope that answers your question. If not, I'll be quiet now.
Posted By: jrilla
Date Posted: October 09, 2003 at 9:41 AM
All I know is that one of them is called a cold start wire. The car will start fine with just the main wire, but I bet when it is cold it both wires together would start the car better. That doesnt answer the question entirely though since so many cars get away with only one wire and they start fine when the engine is cold.
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J Rilla
Owner/Installer
Posted By: profuse007
Date Posted: October 09, 2003 at 10:05 AM
okay, the cold start thingy trick my mind out right now. it doesnt make sense (or am just a retard) when does it know to switch to cold start and warm start? if this is the case, the car is too sophisticated then. on the ones that have only 1 wire, you slightly hold down for a bit longer for cold start.
thanks for the replies yall
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Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).
Posted By: jrilla
Date Posted: October 09, 2003 at 10:14 AM
It uses both wires all the time. I mentionmed that the car starts fine with only one wire because I tried to remote start a vehicle once with only one starter wire when it was awrm and it started fine. Then I hooked both up and there was no improvement.
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J Rilla
Owner/Installer
Posted By: derek123
Date Posted: October 09, 2003 at 10:35 AM
The 2nd start is for more fuel during crank, no? Instead of pulseing the injectors, it sends "fullblast", as determined by the computer.
Posted By: profuse007
Date Posted: October 09, 2003 at 12:55 PM
so its kinda act like a carburator where you have to squeeze some fuel in to get it start?
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Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).
Posted By: Dphil
Date Posted: October 31, 2003 at 8:50 PM
I worked overhauling starter motors for over 20 years.But I have not touched one in the last five years.I have lost touch a bit with things but this info may help explain the extra wire. The first wire that is connected from the ignition brings in the solenoid to energise the starter motor. The second wire sends out a feed when the starter is engaged. The reason for this is that the battery voltage will drop from 12v to 9v ( approx ) when the starter is turning. Older type ignition systems used an ignition coil with a resistor .This coil opperated at 9 volts under normal running. When the starter was ingaged the second wire would feed the coil, bi- passing the resistor.This kept the coil voltage constant under cranking power. I am sure this theory applies to what ever system you have.In short it does not allow the voltage drop to effect what ever circuit is being feed,to give you better starting. Phil
Posted By: Haku
Date Posted: November 01, 2003 at 5:06 PM
If im off the mark, disregard... But it seems to me that he wants to know why there are two starter wires at the ignition switch. It thats the case, I will try to explain. For example (2000+ nissan). They have two starter wires coming from the igniton switch. One is a normal starter wire, which goes to the starter relay.
The other wire goes through a fuse, and to the ECM. Im pretty sure it does this so the ECM knows that you are cranking the engine, why it does this confuses me. It can tell the engine is cranking by the cam/crank sensor. Other than that, it would be useless to have two starter wires. It does not "crank" the starter. It is a low amp circuit with a relay. (usually)!! Hak ------------- Hak
Siemens Autostart
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