1200 Voltage Regulator maybe too hot?


Information and questions on GL1200 Goldwings (1984-1987)
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hotwire
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Motorcycle: 1985 gl1200 aspencade

1200 Voltage Regulator maybe too hot?

Postby hotwire » Sat Jun 23, 2012 10:24 pm



Does anyone know just how hot the voltage regulator on my 1200 should get, that is, what's too hot? With two DVMs attached, one to the battery, and the other at the cigarette lighter plug, everything on, (just stock lighting w/ headlight on hi-beam), running at a fast idle to around 3,000 r.p.m., I get 14.5 volts on the battery and about 13.8 at the lighter plug. Dies down at idle to about 13.7 at batt. and 12.5 at plug. In just a small time, the regulator is hot enough where it is very hard to keep your hand on it. I know there are a lot of electrons moving and the heat sink is there for that, but is that too hot, you think? I was thinking when the top cover goes back on, the air is going to be more limited to it, as well.
Any ideas? thanks for your input. Didn't know if anyone had ever bothered to feel one while the bike is running, just don't wanna get out and have a meltdown. Thanks again, h.w.



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WingAdmin
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Re: 1200 Voltage Regulator maybe too hot?

Postby WingAdmin » Sun Jun 24, 2012 10:41 am

The regulators do run very hot. Have a look at this topic: viewtopic.php?t=7057&p=31138

14.5 is a bit high - when the bike is running, measure the difference between the battery positive terminal, and the black wire at the regulator.

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virgilmobile
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Re: 1200 Voltage Regulator maybe too hot?

Postby virgilmobile » Sun Jun 24, 2012 10:51 pm

Lets see if I can do this without a calculator...
My 1200 draws 11 amp for the electrical system (11x14=154watts)
It charges my battery at 3.5 amp while running (3.5X14=49 watts)
let's see...that's 13 carry the 1 and it adds up to 203 watts the bike uses from the charging system.
Now at 3000 rpm or so,the stator will provide around 300 watts,maybe a bit more.
So the regulator has to shunt the excess power.
Sheesh that's like trying to hold onto a 100 watt light bulb.
Its designed to dissipate that kind of heat.
Now this is a good system that has had all the mods done to it....Soldered ALL the charging system wires (including the regulator)and bypassed the ignition sense wire to the regulator with a switching relay.

hotwire
Posts: 42
Joined: Mon Sep 05, 2011 8:57 pm
Location: mosheim,tn
Motorcycle: 1985 gl1200 aspencade

Re: 1200 Voltage Regulator maybe too hot?

Postby hotwire » Tue Jun 26, 2012 9:53 pm

Thanks, guys, your replies and good input is much appreciated, and the calculations make sense, too, Virgil. I've got a digital meter strapped on board temporarily just till I'm sure the charging is gonna stay good. ( One of the yellow stator wires at the regulator plug burned off, is what started this whole mess.) I did the charging checks initially after repairing all those wires, ( at the stator end, too !), out of the Honda service book, but the regulator failed according to the info in the manual. Before just buying another, I decided to go thru the wiring and connectors and clean / replace stuff that was a potential problem and put my regulator back on. Seems to be charging just great, a little high, but not out of specs. Was really just not sure how hot the thing might get, but what you guys both said makes a lot of sense, once again. and again, thanks.

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virgilmobile
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Re: 1200 Voltage Regulator maybe too hot?

Postby virgilmobile » Wed Jun 27, 2012 8:07 am

If it's high,use the DVM and measure the volts from the battery positive to the black wire on the regulator.it should be less than 0.5 volts.if it's much over the regulator will boost the main line till it sees the right voltage there.if it is over 0.6 volts, cut it loose and use a relay from the battery to run the regulator and the black wire to trip the relay. More details if you need them




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