alt conversion


Information and questions on GL1200 Goldwings (1984-1987)
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minion13
Posts: 2
Joined: Sun Jan 10, 2016 3:17 pm
Location: Surrey,B.C. Canada
Motorcycle: 1984 GL1200 Interstate

alt conversion

Postby minion13 » Sun Jan 10, 2016 4:22 pm



I just did my own alternator conversion on my 84 interstate. I got ideas from watching videos and looking at pictures that were posted on the members forums,but I'm not sure about the wiring.I've seen pics that show the 8ga wire going to the wiring harness for the regulator,and I've seen videos showing the 8ga wire going to the battery, and the regulator still connected. I have removed the regulator from the harness and attached the 8ga wire to it.The bike runs, but I'm not sure if this is the right or the best way to wire this.Can somebody please tell me the right way to wire this and what connections I need to remove.thanks :)
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twocams
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Joined: Tue Sep 29, 2015 11:25 am
Location: Grants Pass, Oregon
Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
Sold : 84 V65 Magna, 82 Moto Guzzi, XS 1100 Yamaha,84 Wing Int., 80 650 Special, Only new bike 82 XV750 Virago (Guam),Honda 250,84 R100RT BMW,87 K100 LT BMW,93 K1100 LT BMW, 91 535 Virago, Honda 50

Re: alt conversion

Postby twocams » Sun Jan 10, 2016 7:19 pm

Not sure if there is a right way or a good way. But when I bought my Wing from a long time friend he couldnt get it to charge after putting a poor boy on. So it sat for 5 yrs. First thing I did was go to O'reilly make sure the alt was still good. Yep. So next where does the hot wire go from Ign. They didnt know. So went to an one man alt. shop in town. He hooked it up to his alt tester....I asked which terminal of the 3 does the Ign wire go too. Showed me, went home and hooked it up,been charging every since. The main lug coming off the alt. is going direct to the positive post of battery. The other wire to ign. when turned on.
Your alt. has a built in regulator. So I would bypass all that old wiring and maybe just wire like my friend did. 2 wires to easy.


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Re: alt conversion

Postby WingAdmin » Mon Jan 11, 2016 9:44 am

There are two wires: the charge wire and the sense wire.

The charge wire normally goes directly to the battery. It is where the power generated by the alternator is sent, to run the bike and charge the battery.

The sense wire is used for two things: to switch the alternator on, and to determine the system voltage.

When the ignition is turned to "ON", +12v is applied to the sense wire. This enables the regulator in the alternator. Once the bike is running, the alternator looks at the voltage on the sense wire. If the voltage is too low, it boosts the output voltage of the charge wire to compensate. Similarly, if the voltage is too high, it reduces the voltage.

It is important that the voltage being applied to the sense wire is an accurate representation of the battery's voltage. The problem arises where the sense wire is connected to the ignition like you would expect. However there are several connectors, fuses, and 25-year-old wiring in between that and the battery, and as a result, the voltage being presented to the sense wire can be lower than that which is present at the battery. On my GL1100, the voltage at the ignition was 1.5 volts lower than the voltage at the battery.

The regulator in the alternator will boost output in an attempt to compensate, with the result that the bike's main bus voltage ends up being too high - which overcharges the battery, shortening its life, and can also shorten the life of light bulbs and other electrical components.

The solution is to run a (fused) wire directly from the battery. Connect this through the Normally Open contacts of an automotive relay, and connect that to the alternator sense wire.

The coil of the relay is then connected to the ignition switch. When the ignition is turned off, the relay is off, and no power is applied to the sense wire. When the ignition is turned on, the relay closes, connecting the sense wire directly to the battery, and enabling the alternator (with an accurate representation of the battery's voltage/state of charge).

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twocams
Posts: 554
Joined: Tue Sep 29, 2015 11:25 am
Location: Grants Pass, Oregon
Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
Sold : 84 V65 Magna, 82 Moto Guzzi, XS 1100 Yamaha,84 Wing Int., 80 650 Special, Only new bike 82 XV750 Virago (Guam),Honda 250,84 R100RT BMW,87 K100 LT BMW,93 K1100 LT BMW, 91 535 Virago, Honda 50

Re: alt conversion

Postby twocams » Mon Jan 11, 2016 11:31 am

Come on wing, I was trying to keep it simple. You dont have anything else to do this early in the morning? :lol: I used to know all that stuff. But the last Tech school I went to was over 40 yrs ago in the USAF. And of course if you dont use it once in awhile... :shock:

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minion13
Posts: 2
Joined: Sun Jan 10, 2016 3:17 pm
Location: Surrey,B.C. Canada
Motorcycle: 1984 GL1200 Interstate

Re: alt conversion

Postby minion13 » Mon Jan 11, 2016 2:53 pm

thanks guys, i'll go that route with the wiring and let you know how things go.




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