3.0L 4cyl (181ci) purple/yellow wire to coil???

[jeff13601]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

My book shows it being fastened on the left stud which is at about nine oclock on the solonoid. Someone may have taken it off because it may have gotten hot if someone left the key on without the motor running

 

[Don S]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

Someone may have taken it off because it may have gotten hot because someone left the key on without the motor running<br />

The ONLY time that terminal (D in my picture) is hot is when the ignition key is in the start position.

 

[austin123]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

The starter was on when I bough the boat so I don't know it's history but lets go through this.<br /><br />Terminal A is battery +<br />Terminal C is hot when starting to run the starter<br />Terminal B is switched + (solenoid engage) from keyswitch (or slave solenoid in my case)<br />So to me terminal D is basically the same as C except not as big as it does not need the current output.

 

[jeff13601]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

I must have a short somwhere. If I leave my key on without the motor running for a long time the purple yellow gets hot

 

[austin123]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

The ONLY time that terminal (D in my picture) is hot is when the ignition key is in the start position.

Which is also the same time as the solenoid switched terminal is enabled.

 

[Don S]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

You have to understand how the solenoid works. There is a disc inside. <br />The battery is at A and is always hot. When you turn the ign switch to start, the power goes to B and the solenoid engages and puts power to C to run the starter motor, and at the same time power is applied to terminal D.<br />On newer engines without points and electric fuel pumps, terminal D is used to energize the fuel pump while cranking.<br />Don't ASSUME anything.

 

[austin123]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

I understand that the wire is supposed to go on the terminal D but I am trying to get accross (and understand) what the function is.<br /><br />You are telling me that this wire provides full battery voltage to the + side of the coil ONLY when cranking the boat. Is that correct?

 

[jeff13601]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

I contacted a mechanic 4 years ago because I didnt think it was right getting hot like that. He told me it was normal and I didnt think it was. Its been like that since I owned the boat. Any ideas

 

[austin123]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

RE-POST<br /><br />I understand that the wire is supposed to go on the terminal D but I am trying to get accross (and understand) what the function is.<br /><br />You are telling me that this wire provides full battery voltage to the + side of the coil ONLY when cranking the boat. Is that correct?<br /><br />I am going to call it a night, it is 12.30 and I have to be up early for work so will check the forum again tomorrow. Thank you for all of the help and advice so far. Hopefully I can catch you tomorrow.<br /><br />Austin.

 

[Don S]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

You are telling me that this wire provides full battery voltage to the + side of the coil ONLY when cranking the boat. Is that correct?

Yes, that is correct.

 

[Don S]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

Jeff, if you leave the ignition switch in the run position, the purple/yellow wire should not get hot. <br />Since it is connected on the coil on the + side, it will see the approximatly 8 volts provided through the resistor wire. even at the end attached to the starter terminal D, but the solenoid inside is NOT making any contact, and should never be to ground. If it were, it would be a direct short and you would have no power to your points.<br />You might want to do a physical trace of the wires and make a diagram and compare it to how it should be.<br />There is no way that wire should be hot, if it is wired as shown in my first wiring diagram.

 

[austin123]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

OK I am really going to bed now honest!<br /><br />But before I do... providing that this is in fact a marine starter (which I will remove and check) by connecting this loose wire to the terminal B in your diagram it would do exactly the same thing as connecting it to terminal D. If I did not have a slave solenoid (as in the later boats) then if I did this I would be asking for ignition wiring to power the coil which would be wrong. But I have a slave solenoid before the starter which is providing me direct battery voltage so in my case I should have no trouble connecting the wire to terminal B.<br /><br />Your opinion??

 

[Don S]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

NO, don't hook it to B, why would you do that????<br />It does not do the same thing.<br />It hooks to D, nowhere else.<br />Terminal B actuates the solenoid.<br />The disc inside the solinoid connects terminals A, C and D when B is energised.

 

[austin123]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

Because as you said previously...<br /><br />

Originally posted by Don S:<br />...When you turn the ign switch to start, the power goes to B and the solenoid engages and puts power to C to run the starter motor, and at the same time power is applied to terminal D.<br />

And at the same time goes to terminal D, you said it yourself. <br /><br />The only difference is that (and correct me if I am wrong which I am sure you will do) D is actually supplied by A internally when you supply power to C.

 

[austin123]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

So going back to my previous statement.....<br /><br />On my boat which has a slave solenoid before the starter, the yellow/red wire going to the terminal A is actually switched battery +. All this wire does is power the starter solenoid...period.<br /><br />In turn the STARTER solenoid provides +12v battery voltage (terminal A) to the starter (terminal C) and to the coil (terminal D).<br /><br />All I am asking the yellow/red wire to do is additionally power the coil + at the same time as the starter solenoid for the few seconds it takes to start the engine.<br /><br />Believe me if I had a terminal D i'd use it!

 

[Don S]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

The only difference is that (and correct me if I am wrong which I am sure you will do) D is actually supplied by A internally when you supply power to C.

You do not "Supply" power to C<br />Your battery is directly connected to A (always hot)<br />When you hit the ign switch to start you put 12 V to termianl B<br />That energises the solenoid that pushes the bendix into the teeth of the flywheel and at the same time applies power from terminal A to terminal C to make the starter motor run.<br />At the same time contact is made with terminal A and C, it also makes contact with B.

 

[olbuddyjack]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

edit: I like ataylor's reason better...

 

[ataylor]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

Hi all, <br />Let me try and simplify this for you.<br /><br />If you connect your spare wire to teminal B, yes you will feed the coil with 12v upon start up, BUT you will also power up the solenoid from the resisted wire(coil) when the engine is running, as voltage will come back down this wire from the coil. <br /><br />If you connect your spare wire to terminal C, again you feed the coil with 12v on start up, BUT you will also feed the starter motor, from the coil, when the engine is running.<br /><br />If you wanted to feed the coil with 12v upon start up (without changing your starter). The only way you can do it is install a diode in this spare wire, then it should be ok to connect to teminal C. As this will let current flow up to your coil but not back to the starter.<br /><br />But please remember 1 thing, IF IT 'AINT BROKE, THEN D'ONT TRY AND FIX IT.<br /><br />Hope this helps<br /><br />Ady.

 

[austin123]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

here is the thing.......<br />The original post was asking what the wire was for. That was determined and much thanks. I understand the concept of it and the resistor wire etc etc.<br />ataylor just hit the nail on the head about the coil voltage when the boat is running. I had not thought of that and that is the reason there is a terminal D, it isolates the running coil voltage from the solenoid.<br />Alternative to a coil would be a new starter ($$) a diode (cheap) or another solenoid to isolate the 12v from the starter solenoid when running.<br /><br />Thank you ataylor

 

[austin123]

Re: 3.0L 4cyl (181ci) purple/yellow wire to coil???

Originally posted by Don S:<br />

The only difference is that (and correct me if I am wrong which I am sure you will do) D is actually supplied by A internally when you supply power to C.

You do not "Supply" power to C<br />Your battery is directly connected to A (always hot)<br />When you hit the ign switch to start you put 12 V to termianl B<br />That energises the solenoid that pushes the bendix into the teeth of the flywheel and at the same time applies power from terminal A to terminal C to make the starter motor run.<br />At the same time contact is made with terminal A and C, it also makes contact with B.

It was late, I meant to say B<br /><br />I told you you would correct me