bad voltage regulator? - Honda Shadow Forums : Shadow Motorcycle Forum

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Old 07-27-2008, 07:01 PM   #1 (permalink)
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Default bad voltage regulator?

i noticed my headlight was extremely bright so i threw a voltmeter on it with it running and it steadily climbed all the way to about 18v,and i made sure to check the voltmeter on my car which read about 12.5v,does this mean i need a voltage regulator?if so where is a good place to get one for an 86 vt700?thanks,joe
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Old 07-27-2008, 07:19 PM   #2 (permalink)
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Bike Bandit http://www.bikebandit.com/houseofmot...w-1986/o/m2875 carries one but its $189, it is in the sub-window for "Battery" then item # 6 on the list.

If you are any good at electronics you could try cracking it open and see if it is repairable, other than that I would check your local salvage yards for a used one.
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Old 07-27-2008, 08:10 PM   #3 (permalink)
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Check out the E-bay store RMSTATOR. They may just have one.
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Old 07-27-2008, 08:42 PM   #4 (permalink)
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Check with electrosport. They make good products.

http://www.electrosport.com/street/s...reet_44100.php

This parts should fit. http://www.electrosport.com/products...detail-624.php

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Old 07-27-2008, 08:57 PM   #5 (permalink)
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My brand new Electrosport was reading 18.95 volts. Long story short, I found out that my battery cable was nearly broken in half. I repaired it and was back to normal.

Before buying a new regulator, do a load test on your battery and check to be sure that all of your connections are clean and tight.
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Old 07-28-2008, 07:56 AM   #6 (permalink)
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A high voltage form the regulator usually means that it's not getting either a good ground, or there's some corrosion interfering with it. If there's extra resistance in the system somewhere, the sensors in the regulator get a false reading, and it tries to compensate for it. It really throws your voltage off.

If the regulator is regulating 18V, then the components in it are likely to be okay. It's just having some trouble reading what the bike has, so it's doing the wrong thing.

--Justin
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Old 07-28-2008, 08:39 AM   #7 (permalink)
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Check the output voltage from the rectifier. Under the seat you will find a plug with a red wire coming from the rectifier. Hook your meter to ground and the red wire, start the bike and you should read 12 to 13 volts at idle. As you rev the bike your voltage should climb to no more than 15.2 volts. Hope this helps.
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Old 07-28-2008, 03:09 PM   #8 (permalink)
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well ive already checked and cleaned all wires and connections but i just found out my battery is junk and i fried the rectifier because it wouldnt start due to the dead battery so i put a charger on 70amp boost and then it started right up but the headlight was white it was so bright and it never was like that before,a motorcycle mechanic told me that putting a charger on 70amp boost would fry the regulator/rectifier in a second, if this is false is there a way to test resistance on the r/r because i already have it off the bike,thanks,joe
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Old 07-28-2008, 04:58 PM   #9 (permalink)
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Check this link. It may have infomation you can use.

http://www.hondashadow.net/forum/vie...ght=alternator
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Old 07-28-2008, 05:04 PM   #10 (permalink)
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Purchased a regulator/rectifier off e-bay for less than $100 with shipping For 87 1100. New, exact part.

email of seller. valleyms@comcast.net
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