Temp and Fuel Gauges Reading High Maybe.


Information and questions on GL1000 Goldwings (1975-1979)
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jmayhallfb23
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Joined: Tue Nov 26, 2019 9:38 am
Location: United States
Motorcycle: 1978 Gl1000

Temp and Fuel Gauges Reading High Maybe.

Post by jmayhallfb23 »



Good Evening,

This is my first post in the GL 1000 Forum. I have a 1978 GL 1000 hat was sitting for about 10 years in a shop and 2 in the weather. This is what I know of it. As it has not be registered since 1996 from what the title and plate said. I have rebuilt the whole thing from top to bottom but I'm having an issue with the Temp Or I think.

Here is my issue.
When the bike is started it starts and runs like a champ. Let it warm up for 15 minutes or so and the temp gauge doesn't stop going up to the H. I can turn off the ignition and leave the power on and the temp goes back down to about half way. I have replaced the Fan switch, Thermostat, and waiting on the Sensor sending unit to some in. It doesn't seem to be getting crazy hot by any means.

Now I did have to skip my 7V regulator in the dash cluster as it didn't work when I toughed the dark green with the Black and the White red with the red on the ohm meter there was a connection........ So I skipped it. Knowing the Fan switch is good and the Thermostat is good. I feel like it is a miss reading along with that the gas gauge tells me I have half a tank when I know its only 1 gallon if that at this point.

Only thing I have not done yet for the cooling system is a new pump But I believe it is working as I don't have any leaks and I put water in it then add food coloring and let it run for 5 minutes and then drained the water. The water was blue. But who know this think was sitting forever.

Any advice would be helpful I searched and couldn't find anything on the form or maybe I was not putting in the correct words to search.
PS. First picture is of it now and second Pictures is how I got it.
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DenverWinger
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Re: Temp and Fuel Gauges Reading High Maybe.

Post by DenverWinger »

A good test for the 7v regulator, which if out-of-spec can make your gauges read high, is to disconnect the fuel sensor lead from the top of the fuel tank, and with the key "on" measure the voltage from the disconnected sensor lead to ground. It should be exactly 7 volts, give or take a tiny fraction. If it reads significantly over 7 volts your 7v regulator has failed or the ground connection to the regulator is questionable.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

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jmayhallfb23
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Joined: Tue Nov 26, 2019 9:38 am
Location: United States
Motorcycle: 1978 Gl1000

Re: Temp and Fuel Gauges Reading High Maybe.

Post by jmayhallfb23 »

DenverWinger wrote: Fri Oct 16, 2020 7:42 am If it reads significantly over 7 volts your 7v regulator has failed or the ground connection to the regulator is questionable.
Welllllll after a lot of research and learning lol. I learned this 7 volt regulator is important lol. Like i said in my post to start with (Me being an idiot. :oops: ) I skipped the 7volt regulator as it was giving me problem and since I was redoing all the wiring and doing it myself I didn't think I needed it .......... (Im an idiot!)

So I took everything apart and tested the 7volt regulator lol. No wonder I skipped it. My understanding the Red/White(R/W) is 12v Input and the Dark Green(DG) is Ground and the Green/Black(G/B) is the 7volt Output.

See pictures below and tell me if something is afoot lol.
I have ordered the new 7Volt regulator and we will see if it fixes my Overheating Panicking lol. and my fuel gauged telling me I have half a tank when I only have 1gallon in a empty tank lol.
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DenverWinger
Posts: 1706
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: Temp and Fuel Gauges Reading High Maybe.

Post by DenverWinger »

You have to connect both the 12v and ground to the regulator before you'll see regulated 7v on the output (between output lead and ground..... So the test in your photos doesn't reveal anything except incomplete test setup.

But a new regulator should fix the gauges with scary readings.... :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
jmayhallfb23
Posts: 4
Joined: Tue Nov 26, 2019 9:38 am
Location: United States
Motorcycle: 1978 Gl1000

Re: Temp and Fuel Gauges Reading High Maybe.

Post by jmayhallfb23 »

DenverWinger wrote: Fri Oct 16, 2020 5:04 pm You have to connect both the 12v and ground to the regulator before you'll see regulated 7v on the output (between output lead and ground..... So the test in your photos doesn't reveal anything except incomplete test setup.

But a new regulator should fix the gauges with scary readings.... :D
Any time I hooked the battery + to the Red/White and the battery - to the DG it just smokes the wires. Cant wait for the new one to come in.
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Re: Temp and Fuel Gauges Reading High Maybe.

Post by WingAdmin »

Guaranteed that's your problem - when you don't have the 7 volt regulator, it's putting too much voltage into the meters (more like 14 or 15 volts), which is why they are reading so high. I wouldn't run it like that for long, as it can damage the meters.

You got it right - red is +12v input, green is ground, black is +7 volt output.


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