Neutral light will only come on when clutch lever is pulled


Information and questions on GL1100 Goldwings (1980-1983)
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delpy432
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Neutral light will only come on when clutch lever is pulled

Postby delpy432 » Mon Oct 25, 2010 8:31 am



Why would the neutral light only come on when the clutch lever is pulled in?



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WingAdmin
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Re: Neutral light will only come on when clutch lever is pul

Postby WingAdmin » Mon Oct 25, 2010 10:27 am

There is a diode mounted to the left side of the frame, underneath the false tank, near the turn signal flasher. It has failed. Replace it, and it will fix the problem.

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Re: Neutral light will only come on when clutch lever is pul

Postby thrasherg » Mon Oct 25, 2010 10:41 am

As wingman states, there is a diode so that the starter motor will engage when the bike is in neutral or the clutch is pulled in. Sounds like the diode has failed or you have a wiring issue..

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Re: Neutral light will only come on when clutch lever is pul

Postby virgilmobile » Mon Oct 25, 2010 4:29 pm

Question:: you said "neutral light only come on when the clutch lever is pulled in".Can I assume it does not come on with key on and in neutral?That's a bad neutral switching problem(see red circled pix).If the indicator comes on when pulling in the clutch then the diode is shorted or in backwards(yes it does have a polarity).On a diode the arrow points to the + or a line on the case,this will be Lg/r.A diode can be tested using a ohm meter(it will have some continuity one way but not the other).The diode is in circuit to prevent backfeed from the light to the clutch switch.even out of circuit the wiring allows starting using the clutch switch,it grounds the other side of the relay.
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Re: Neutral light will only come on when clutch lever is pul

Postby delpy432 » Mon Oct 25, 2010 5:05 pm

Thank you guys, I am a newbie and wondering do I have to take the false tank off to get to this diode and if so how do I do this? I had a problem earlier with the battery draining and you guys were very helpful it seemed that I got in a rush and did not turn the key all the way to off and it was on ACC. :shock: My bad!

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Re: Neutral light will only come on when clutch lever is pul

Postby virgilmobile » Tue Oct 26, 2010 3:34 pm

4 bolts,remove seat,2 there,1 on each side near the front . 10mm head.The neutral light should come on in neutral regardless of the diodes condition.

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Re: Neutral light will only come on when clutch lever is pul

Postby WingAdmin » Tue Oct 26, 2010 7:44 pm

delpy432 wrote:Thank you guys, I am a newbie and wondering do I have to take the false tank off to get to this diode and if so how do I do this? I had a problem earlier with the battery draining and you guys were very helpful it seemed that I got in a rush and did not turn the key all the way to off and it was on ACC. :shock: My bad!


Yes, the false tank has to come off - see: How to remove and replace your false tank. The diode just unplugs and a new one plugs in its place.

While you've got it off, why not replace the flasher with a new electronic one - that way you stave off a future failure (which will have you removing the tank again), and allow you to replace your turn signals with LEDs.

delpy432
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Re: Neutral light will only come on when clutch lever is pul

Postby delpy432 » Wed Oct 27, 2010 6:35 am

Yes, the false tank has to come off - see: How to remove and replace your false tank. The diode just unplugs and a new one plugs in its place.

While you've got it off, why not replace the flasher with a new electronic one - that way you stave off a future failure (which will have you removing the tank again), and allow you to replace your turn signals with LEDs.


Thank you guys, that is not a bad idea. I will check with my local parts dealership and get prices and replace both at the same time. While I'm here, is it normal for the bike to smoke at start up? After it has ran for a while it goes away, my guess is the valve seats are leaking oil and it it burns the excess oil at start up.

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Re: Neutral light will only come on when clutch lever is pul

Postby WingAdmin » Wed Oct 27, 2010 10:27 am

It's pretty common for these bikes to smoke a bit at start, particularly if they've been sitting on the side stand for any amount of time. Gravity can cause oil to gradually seep past rings/valves as the bike sits, unlike an engine that has the cylinders pointing upward.

Your dealer won't likely have an electronic flasher. I put the CF13JL-02 model from SuperbrightLEDs in my 1100, and it works great.

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Re: Neutral light will only come on when clutch lever is pul

Postby WingAdmin » Fri Oct 29, 2010 2:31 pm

You can get a replacement diode at PartsNMore for $9.

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Re: Neutral light will only come on when clutch lever is pul

Postby delpy432 » Mon Nov 01, 2010 6:55 am

I took the false tank off this weekend, I believe I found the diode but can't be sure. There was nothing else down there that I could swap it with so I could not test to see if this was it. I just want to know if it is square or round, the piece i was working with was square, I couldn't get my multi-meter to work :x so i could not test this piece out.

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Re: Neutral light will only come on when clutch lever is pul

Postby virgilmobile » Mon Nov 01, 2010 7:23 am

I believe they are square about 3/8"x1-1/4" with 2 wires.It can be tested with a 12 volt test probe.hooked up one direction it will light the probe,reverse the diode and the light stays off.the diode is a one way electric valve.if it lights up both ways,the diode is shorted.See my crude drawing to test it.Does the neutral light come on when the trans is in neutral?Virgil
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Re: Neutral light will only come on when clutch lever is pul

Postby WingAdmin » Mon Nov 01, 2010 8:23 am

Here's what it looks like (picture taken from PartsnMoresite):
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GL1100 Diode
GL1100 Diode

delpy432
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Re: Neutral light will only come on when clutch lever is pul

Postby delpy432 » Mon Nov 01, 2010 11:20 am

virgilmobile wrote:I believe they are square about 3/8"x1-1/4" with 2 wires.It can be tested with a 12 volt test probe.hooked up one direction it will light the probe,reverse the diode and the light stays off.the diode is a one way electric valve.if it lights up both ways,the diode is shorted.See my crude drawing to test it.Does the neutral light come on when the trans is in neutral?Virgil


It does not come on when the trans in neutral, it will only come on when the clutch lever is pulled in.

delpy432
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Re: Neutral light will only come on when clutch lever is pul

Postby delpy432 » Mon Nov 01, 2010 11:22 am

WingAdmin wrote:Here's what it looks like (picture taken from PartsnMoresite):


Fortunately, I did not see anything that looked like that, I will look again and see, i will bring the part to work and test it. Thank you guys again.

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Re: Neutral light will only come on when clutch lever is pul

Postby WingAdmin » Mon Nov 01, 2010 11:52 am

Here is what you are looking for:
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GL1100 Diode Location
GL1100 Diode Location

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Re: Neutral light will only come on when clutch lever is pul

Postby virgilmobile » Mon Nov 01, 2010 1:13 pm

I still believe there is another problem.As per the schematic the neutral light is operated from the neutral switch,the light should come on in neutral regardless of the rest of the circuit.It's a simple 12volt to a bulb and ground through the switch.The diode only carries the current from the neutral switch to the start solenoid.The fact that the clutch switch will turn on the light means that the diode is shorted or in backward.The light works so it's got 12volt,the switch to ground does not work.

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Re: Neutral light will only come on when clutch lever is pul

Postby delpy432 » Mon Nov 01, 2010 1:24 pm

So the box above the rectifier is the diode, I definitely did not mess with that this weekend. Thanks Wingadmin, I will test this and see if this is the problem. If not can you show me a picture of where the neutral switch is?

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Re: Neutral light will only come on when clutch lever is pul

Postby WingAdmin » Mon Nov 01, 2010 2:02 pm

delpy432 wrote:So the box above the rectifier is the diode, I definitely did not mess with that this weekend. Thanks Wingadmin, I will test this and see if this is the problem. If not can you show me a picture of where the neutral switch is?


Have a look at step 74 of How to remove and replace your water pump and you'll see it.

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Re: Neutral light will only come on when clutch lever is pul

Postby WingAdmin » Mon Nov 01, 2010 2:09 pm

One side of the neutral light is supplied +12V from the engine fuse, when the ignition is in "ON".

The other side of the neutral light connects to two things: the neutral switch, and the diode. The diode is set up so that current can flow only TO the neutral switch. The other side of the diode is connected to the clutch switch, as well as the negative side of the starter solenoid.

This is so that the starter solenoid will function when EITHER the clutch is depressed, OR the neutral light is on (neutral switch is closed). The diode prevents power flowing from the neutral light to the clutch switch. This means that when you pull the clutch lever, the neutral light won't turn on.

If the neutral light turns on when you pull the clutch lever, then 100% guaranteed the problem is a failed diode - it's failed and allowing power to run the wrong direction.

If the neutral light turns on when you pull the clutch lever, AND it does NOT turn on when the transmission is in neutral, then you have two separate problems:

- Failed diode
- Neutral switch failed, and/or wire/connectors going to neutral switch have broken/come disconnected

delpy432
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Re: Neutral light will only come on when clutch lever is pul

Postby delpy432 » Mon Nov 01, 2010 8:19 pm

Thank you wingadmin, I did not know that it worked like that, it makes more sense now. At first I would have thought that the neutral switch would have gone bad just because the light comes on when the clutch lever is pulled in. I did not know that it had two functions. I really appreciate it. :D

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Re: Neutral light will only come on when clutch lever is pul

Postby Wilcoy02 » Thu Dec 04, 2014 1:01 pm

31700-124-008 is the Honda part number.




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