Hello and a problem. No spark/low voltage.


Information and questions on GL1000 Goldwings (1975-1979)
W109driver
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Location: Devon. England
Motorcycle: 1976 GL1000

Hello and a problem. No spark/low voltage.

Post by W109driver »



Hi guys.
Bought a 1976 GL1000 last year.
Bought as a kinda running project.
Only rode it once.
Them wouldn't start again.
Put in shed and forgot about it.
Now gotta clear shed. Soooooo......

Been searching around on internet. Slowly learning.
I've got a Haynes manual. a multimeter and a basic understanding of how engines work.


W109driver
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Location: Devon. England
Motorcycle: 1976 GL1000

Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

Can I post pics?

Ok, I think the problem is low voltage at points/breakers.
I've got 12v at battery and starter relay(?) By battery box.

But with ignition on I've only got 5.5v at points. 5.5v on one side. 0.04 on other side.
Turned it over and same voltages reverse.

Found coils but can't see where to take voltage readings.
Thanks in advance guys. xx lol.
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winguyjo
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Re: Hello and a problem. No spark/low voltage.

Post by winguyjo »

a better troubleshooter than i will be along soon, but just to clarify ... you have a cranking no-start condition, as opposed to a no-crank, no start ?
W109driver
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Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

Hi Jo. Yes. Sorry it cranks over.

Got 12v to the resistor(??)capacitor(??) connectors on the coils. But can't see have how to further test them. It is all so tight in there.
Also 5.5v at the points.
12v with the capacitor disconnected that sits under the heatsink infront of the battery compartment.

There is the odd splutter and pop, but it won't start.
Some mystical guru's help would be awesome! Lol.
W109driver
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Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

Anybody out there???
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Maz
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Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
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Re: Hello and a problem. No spark/low voltage.

Post by Maz »

First suggestion is to take a look at the wiring diagram. You don't necessarily need to understand it fully, but at least you can trace wire colours.
You should see 12v at both coils on the black/white wire. The voltage then comes out of the coils on a yellow wire, for one coil and blue wire for the other. These wires then go to the points, where they are grounded when the points are closed. With ignition on, you should be able to read voltage on the blue or yellow wires IF THE CORRESPONDING SET OF POINTS IS OPEN. It will be slightly less than 12v as this is measuring voltage after the coil. Try this measurement with and without the condenser (capacitor) connected. If it reads lower with the condenser connected, the condenser is shorted out, which will prevent spark.
Maz
Ironically, Common Sense is the LEAST common of all senses!
W109driver
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Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

Thankyou Mark.
Yes that looks likely.
The condenser you speak off is the one under the heatsink in front of the battery compartment, right?
It looks new (ish) I wonder if the previous owner installed wrong spec?
Any idea of the correct type to ask for?
Thanks again. Karl.
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Maz
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Re: Hello and a problem. No spark/low voltage.

Post by Maz »

Readily available online. Just Google GL1000 condenser. It's actually 2 separate condensers held together with a metal bracket.
Maz
Ironically, Common Sense is the LEAST common of all senses!
W109driver
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Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

Thanks Maz.
Will look into it.
👍
W109driver
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Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

Hi guys.
Some progress.
I've obviously been barking up the wrong tree.
Changed plugs.
Changed resistor.
Bought new battery.
Nothing.

In frustration, sprayed carb cleaner into airbox.
Coughed and spluttered into life.
For 3 seconds.

Sooooo........
Checked fuel tank. 1/4 full.
Checked fuel tap. Works.
Checked fuel pump. Works.

So it's carb set up. ?
Where do I start.?
Bear in mind that this bike run when I bought it.
Was hard to start though.

All fuel lines and vacuum hose. Look ok.
No leaks.

Have vacuum gauges but need it running for that. How do I mate it start?
Thanks chaps.
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Maz
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1979 CB750L
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Re: Hello and a problem. No spark/low voltage.

Post by Maz »

OK so you definitely have a fuel issue. How old is the fuel in the tank? Is the fuel filter clean? Is fuel actually getting to the carbs?
Pull the fuel pipe off the carbs and put the end into a jar, then spin the engine over. Is fuel spurting out of the tube? If so, pump is good. If not, and fuel is definitely reaching the pump, pump is bad. Try setting up a temporary fuel feed to the carbs. Keep the temporary fuel 'tank' higher than the carbs to allow gravity feed.
Unscrew the float bowl drain screws one by one to check there is fuel in each carb. If there is, it's obviously not getting through the carbs, so they will need stripping and thorough cleaning. If they are dry, fuel is not getting through the float valves, so the carbs will need stripping and thorough cleaning.
Maz
Ironically, Common Sense is the LEAST common of all senses!
W109driver
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Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

It lives!

But God damn do I feel dumb.
After checking everything.... Plugs. Condenser. Batter..
It was the gas.!

Drained and put in my van. Lol.
And fresh gas and it started.
Never had that before. Live and learn and check the bloody obvious guys. Lol.
W109driver
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Location: Devon. England
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Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

It lives!

But God damn do I feel dumb.
After checking everything.... Plugs. Condenser. Batter..
It was the gas.!

Drained and put in my van. Lol.
And fresh gas and it started.
Never had that before. Live and learn and check the bloody obvious guys. Lol.
W109driver
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Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

Ran nice. Looks of smoke and condensation to start but it got really hot.

Gauge got right near top.
But no fan.
When should fan come on?
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DenverWinger
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Re: Hello and a problem. No spark/low voltage.

Post by DenverWinger »

If all things are working right the fan should come on between a little over half scale but before 3/4 scale.

But if the 7volt regulator is going bad the temperature gauge could work it's way to full-scale hot when the engine is just starting to nicely get warmed up.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark
W109driver
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Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

Thankyou. That's interesting.
Does the same regulator work the fuel gauge as well...?
Fuel sender seems work fine but gauge registered 1/3 full even when fully drained.
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DenverWinger
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Re: Hello and a problem. No spark/low voltage.

Post by DenverWinger »

Yup - Both gauges are on that regulator. More evidence the regulator is bad and putting out 12 volts instead of 7.

A test: Disconnect the fuel gauge lead from the sender and measure voltage from that lead to ground with key "on". Should be exactly 7 volts or a fuzz less. If significantly over 7 volts, this confirms a bad regulator.

Not hard to find a new one, WingAdmin sells replacement regulators on this site. :D
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark
W109driver
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Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

Will look into that.

I'm in the UK.
Problem with getting anything from the states is that the postage and possible customs taxes cost more than the part!

Which is a shame because you guys have all the bits for everything! Lol.
W109driver
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Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

Bit of Googling. There are a couple of regulators.
Which one are we talking about?
Part number?
Thanks.
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DenverWinger
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Re: Hello and a problem. No spark/low voltage.

Post by DenverWinger »

There's the regulator for the alternator/charging. Not that one.

Then there's the 7v regulator for the instruments. Used in both the GL1000 and GL1100, parts fiche for the 1980 1100 shows part# 31410-463-008.

Shame shipping/taxes so expensive, but you could ask WingAdmin about cost of shipping this piece, he does ship worldwide.

You may have luck getting a used one from a local bike breaker though. These regulators really don't fail that often....
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark
W109driver
Posts: 89
Joined: Tue Sep 08, 2020 10:11 am
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Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

12.3 volts at fuel tank sender. :shock:

Rode it round block though. Feels great except Speedo is whinning like a stuck cat and the rear brake is binding. Was untouchable are 200metres. :roll:

Bleed rear brake???
Any ideas about Speedo?

Thanks chaps.
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Maz
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Re: Hello and a problem. No spark/low voltage.

Post by Maz »

W109driver wrote: Mon Sep 28, 2020 8:48 am 12.3 volts at fuel tank sender. :shock:

Rode it round block though. Feels great except Speedo is whinning like a stuck cat and the rear brake is binding. Was untouchable are 200metres. :roll:

Bleed rear brake???
Any ideas about Speedo?

Thanks chaps.
Should be 7v at the fuel sender, as mentioned above, so a new 7v regulator is needed.
Rear brake caliper probably needs stripping and cleaning. Maybe new seals too.
Undo one end of the Speedo cable, pull the inner cable out and clean and lube it. Graphite lube is best. You can use a light oil, but don't put too much near the top - it can work its way into the speedometer and cause oily stains on the dial.
Maz
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Re: Hello and a problem. No spark/low voltage.

Post by WingAdmin »

DenverWinger wrote: Mon Sep 28, 2020 7:55 am There's the regulator for the alternator/charging. Not that one.

Then there's the 7v regulator for the instruments. Used in both the GL1000 and GL1100, parts fiche for the 1980 1100 shows part# 31410-463-008.

Shame shipping/taxes so expensive, but you could ask WingAdmin about cost of shipping this piece, he does ship worldwide.

You may have luck getting a used one from a local bike breaker though. These regulators really don't fail that often....
The shipping costs it calculates are the actual costs charged to me, I don't make any money on shipping. Actually, to be truthful, it usually underestimates, so I lose a bit on shipping. I also eat the cost of shipping supplies, some people charge extra for that. To the UK it's usually around $12-13 for regulators.
W109driver
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Re: Hello and a problem. No spark/low voltage.

Post by W109driver »

Have you got a website?
Can't see it.

Wasn't talk about yourself.
Usually little parts/sensors/senders etc from the states, are say £20 part, then shipping another £20 and then if it gets picked up at customs another £5/8.
Makes little parts really expensive.
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Maz
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1976 CB500T
1979 CB750L
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1993 Suzuki GS500E

Re: Hello and a problem. No spark/low voltage.

Post by Maz »

W109driver wrote: Thu Oct 01, 2020 4:39 am Have you got a website?
Can't see it.

Wasn't talk about yourself.
Usually little parts/sensors/senders etc from the states, are say £20 part, then shipping another £20 and then if it gets picked up at customs another £5/8.
Makes little parts really expensive.
Look at the tabs at the top of this page(or any page on the forum) and click on 'Store'.

Maz


Ironically, Common Sense is the LEAST common of all senses!
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