Gas Guage


Information and questions on GL1000 Goldwings (1975-1979)
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JellyBelly
Posts: 181
Joined: Mon Apr 23, 2012 8:39 am
Location: Southaven, MS
Motorcycle: 2000 Valkyrie GL1500
1978 GL1000 cafe racer (sold)
1977 GL1000 (sold)
1976 GL1000 (parting out)
1985 KZ550 (sold)
2006 CFMoto V5 (sold)
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Gas Guage

Postby JellyBelly » Thu Dec 06, 2012 8:43 am



So my gas gauge works when I turn the bike on. When I start the engine it only reads full. Any ideas?


I love my wings (both Hot and Gold) - check out my blog @ http://wingthing1000.blogspot.com/

Former 76, 77, and 78 GL1000 owner...Upgraded to a Chromed out Valkyrie

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virgilmobile
Posts: 7646
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Gas Guage

Postby virgilmobile » Thu Dec 06, 2012 5:02 pm

My first suspect is the 7 volt regulator mounted behind the gauges.
I think my 78 had the regulator next to the fuses come to think about it.
It's a brass colored box with 3 wires.Maybe 3/4 X 3/4 X 2'' long.Its 12 volts in and 7 volts out.
Second is the sending unit.
Does the temp gauge read OK.
If it's flaky too,the regulator is most likely bad.

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JellyBelly
Posts: 181
Joined: Mon Apr 23, 2012 8:39 am
Location: Southaven, MS
Motorcycle: 2000 Valkyrie GL1500
1978 GL1000 cafe racer (sold)
1977 GL1000 (sold)
1976 GL1000 (parting out)
1985 KZ550 (sold)
2006 CFMoto V5 (sold)
Contact:

Re: Gas Guage

Postby JellyBelly » Thu Dec 06, 2012 5:20 pm

Temp and voltage guages work fine.
I love my wings (both Hot and Gold) - check out my blog @ http://wingthing1000.blogspot.com/

Former 76, 77, and 78 GL1000 owner...Upgraded to a Chromed out Valkyrie

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virgilmobile
Posts: 7646
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Gas Guage

Postby virgilmobile » Thu Dec 06, 2012 5:27 pm

OK...The regulator is the only common point to both,thats why I asked.
It sounds like the sending unit in the tank is bad.
It's a delicate thing as I remember....A strand of resistance wire held tight by a spring and a brass wiper that connects to the outside.
Usually the wire breaks right at the spring connection.
I re-crimped mine once...It lasted fine after that.
It may be worth the winter time to check it out.Trying to find a replacement may be impossible now days.

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JellyBelly
Posts: 181
Joined: Mon Apr 23, 2012 8:39 am
Location: Southaven, MS
Motorcycle: 2000 Valkyrie GL1500
1978 GL1000 cafe racer (sold)
1977 GL1000 (sold)
1976 GL1000 (parting out)
1985 KZ550 (sold)
2006 CFMoto V5 (sold)
Contact:

Re: Gas Guage

Postby JellyBelly » Thu Dec 06, 2012 6:12 pm

I'll look into that. I ride my bike all year round so I'll try to make a weekend out of it.
I love my wings (both Hot and Gold) - check out my blog @ http://wingthing1000.blogspot.com/

Former 76, 77, and 78 GL1000 owner...Upgraded to a Chromed out Valkyrie

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chiltonj
Posts: 9
Joined: Wed Jul 02, 2014 3:39 pm
Location: Simpsonville, SC
Motorcycle: 1978 GL1000 A

Re: Gas Guage

Postby chiltonj » Thu Jul 03, 2014 10:44 am

Mine does the same thing. When i took the seat off, though, i found only one wire going to the sending unit. Could that cause my gauge issues? Does anyone have pictures of a working sending unit?

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WingAdmin
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Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Gas Guage

Postby WingAdmin » Thu Jul 03, 2014 10:54 am

chiltonj wrote:Mine does the same thing. When i took the seat off, though, i found only one wire going to the sending unit. Could that cause my gauge issues? Does anyone have pictures of a working sending unit?


That's correct. 12-15 volts goes to the 7 volt regulator, which regulates it to a constant 7 volts. This power then goes to the meter, and from there through the single wire to the fuel sender. The sender has a variable resistor that is actuated by the float. One end of the resistor is connected to ground, so the resistor varies the amount of current flowing through the circuit (and shown by the meter) as the float moves up and down.




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