GL1200 Charging Issue- My Yellow Wire Resistance Numbers


Information and questions on GL1200 Goldwings (1984-1987)
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jg7248
Posts: 6
Joined: Thu Jul 10, 2014 10:17 pm
Location: Eden Prairie, MN
Motorcycle: 1986 GL1200 Aspencade

GL1200 Charging Issue- My Yellow Wire Resistance Numbers

Postby jg7248 » Thu Jul 17, 2014 9:26 am



Hi All, I'm refurbing an '86 1200A and the battery drains. I knew there was some type of electrical problem when I bought the bike a month ago. I still don't know why you plug one thing in and it's a toaster and plug another thing in and it's a computer but I followed a few threads here on testing the stator. Here's what I found and would seek your judgement on whether my stator is shot.

The Bike:
1. Stock- no extra lights or gizmos
2. 69K, appears to have been well maintained
3. LOTS of corroded connections which have been cleaned up
4. No burned wires at regulator/rectifier. Still has white connector
5. Kill switch and ignition appear to operate well
6. All lights, electronics, gauges work well

The Testing:
1. Good multimeter
2. Yellow wire mod made by PO made using crimped brass connector clips vs soldering. A few wires on each joint are broken but it appears that the majority of wires are good. No sign of burned wires.
3. Solenoid and dogbone appear OK after clean-up of corrosion
4. 12.4 V with motor stopped
5. 13.3 V with motor running at 3000 rpm

The Yellow Wire Resistance:
A to GND >2.0
B to GND = 1.2
C to GND = 1.0

A to B = .5
A to C = .4
B to C = .7

This can be fixed with an oil change, right??
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virgilmobile
Posts: 7653
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: GL1200 Charging Issue- My Yellow Wire Resistance Numbers

Postby virgilmobile » Thu Jul 17, 2014 9:53 am

Everything is close.
The 3 yellow wires...unplug the R/R module and measure the harness wires.
There should be NO continuity to ground..zero...nada...
Each pair (3 coils) should measure the same low resistance ..a-b.. b-c..and c-a...
And a oil change won't help if the stator is cooked

jg7248
Posts: 6
Joined: Thu Jul 10, 2014 10:17 pm
Location: Eden Prairie, MN
Motorcycle: 1986 GL1200 Aspencade

Re: GL1200 Charging Issue- My Yellow Wire Resistance Numbers

Postby jg7248 » Thu Jul 17, 2014 9:59 am

Thanks for the quick reply. Stupid question- when I check the resistance at the R/R do I do it on the plug towards the front of the bike or the one towards the rear?

I knew the oil change wouldn't matter... I was just hiding my head under the covers, so to speak.

jg7248
Posts: 6
Joined: Thu Jul 10, 2014 10:17 pm
Location: Eden Prairie, MN
Motorcycle: 1986 GL1200 Aspencade

Re: GL1200 Charging Issue- My Yellow Wire Resistance Numbers

Postby jg7248 » Thu Jul 17, 2014 10:00 am

Quick update: Checking AC voltage with bike at 3000 rpm I'm getting:

A - B= 14.8 volts
A - C= 13.3 volts
B - C= 10.2 volts

Is this a positive sign?

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virgilmobile
Posts: 7653
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: GL1200 Charging Issue- My Yellow Wire Resistance Numbers

Postby virgilmobile » Thu Jul 17, 2014 11:02 am

You would want to unplug the R/R module and measure resistance of the 3 yellow wires on the bikes harness,not the module.
You can also measure AC there too.
Without the regulator hooked up,you should be measuring around 25 volts AC at 1000 rpm and increasing to upwards of 70 volts AC at 3500 rpm.
If the resistance is different between pairs,measure again as close to the engine side of the repaired plug as possible.They really need to be very close together.
If your still getting different voltages with the regulator unhooked,its a good confirmation that the stator is cooked.Probably due to overloading or contact corrosion.
If all the voltages come up the same,replace the R/R module.

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Ed Z
Posts: 132
Joined: Tue Jun 08, 2010 8:19 am
Location: Baltimore, Md
Motorcycle: 2006 gl1800
1987 gl1200 Aspen
1983 gl650 Intersta

Re: GL1200 Charging Issue- My Yellow Wire Resistance Numbers

Postby Ed Z » Wed Jul 23, 2014 6:35 pm

Are you sure you had your meter in AC mode (not DC).??? Your readings are very low if you had it in AC mode...

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virgilmobile
Posts: 7653
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: GL1200 Charging Issue- My Yellow Wire Resistance Numbers

Postby virgilmobile » Wed Jul 23, 2014 6:42 pm

Ed Z wrote:Are you sure you had your meter in AC mode (not DC).??? Your readings are very low if you had it in AC mode...


Actually not.depending on the type of meter and if the stator was still hooked to the diode block

That's why we recommend testing volts unhooked(static) verses loaded.Then a continuity test.
Even at what was shown,there too wide of voltages.A few tenths but not 2 volt.
Separate the 2 to see if the stator is weak or the diodes are drawing it down.




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