Voltage too high - Snowblower Forum : Snow Blower Forums
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post #1 of 56 Old 01-14-2019, 04:08 PM Thread Starter
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Voltage too high

Hi all.
i have added an led light and hand warmers to my machine, but I keep blowing the led lamp. I have followed the tutorial on this site and checked the wiring 4 times now. Testing shows 18.6 vac to the rectifier, but, 45.3 vdc coming out of the rectifier. I have tried 2 different full wave rectifiers from different companies with the same result. Any thoughts?????
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post #2 of 56 Old 01-14-2019, 04:11 PM Thread Starter
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I forgot to say Tecumseh HMSK100 on a 1996 Yardman 1030.
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post #3 of 56 Old 01-14-2019, 05:39 PM
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You are gonna need a higher voltage bulb or perhaps lose the rectifier
The led conversion post has gotten to large to research effectively.

Red


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post #4 of 56 Old 01-14-2019, 05:55 PM Thread Starter
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[QUOTE=bigredmf;1635553]You are gonna need a higher voltage bulb or perhaps lose the rectifier
The led conversion post has gotten to large to research effectively.

Red



That's why I started a new thread. I know electrical, but not so much about electronics. I did not know that 18 volts could turn into 45 volts, ac or dc.
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post #5 of 56 Old 01-14-2019, 06:05 PM
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As another option, you could run the output of the rectifier through a voltage regulator to limit the voltage to something the LED will be happy with.
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post #6 of 56 Old 01-14-2019, 07:59 PM
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Are you sure you are measuring it correctly? It should be like 45v AC to the rectifier and 14-16v DC

If I can't fix it, I can screw it up so bad that no one else can either!
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post #7 of 56 Old 01-14-2019, 08:03 PM Thread Starter
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Quote:
Originally Posted by Greg13 View Post
Are you sure you are measuring it correctly? It should be like 45v AC to the rectifier and 14-16v DC
I am reading it correctly, and am very confused.
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post #8 of 56 Old 01-14-2019, 09:22 PM
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Sounds like your rectifiers are voltage doublers as well.
With 18.6 VAC, it gives me the impression your voltage measuring device is reading peak voltage rather than RMS. If it is a peak reading meter than the RMS value would be 13.2 VAC RMS. Most

If the meter is reading 18.6 VAC RMS, than with a full wave rectifier and capacitor filter, max voltage would be 26.3 VDC.
Something just dosen't add up.
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post #9 of 56 Old 01-14-2019, 09:40 PM
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Quote:
Originally Posted by tuffnell View Post
Sounds like your rectifiers are voltage doublers as well.
With 18.6 VAC, it gives me the impression your voltage measuring device is reading peak voltage rather than RMS. If it is a peak reading meter than the RMS value would be 13.2 VAC RMS. Most

If the meter is reading 18.6 VAC RMS, than with a full wave rectifier and capacitor filter, max voltage would be 26.3 VDC.
Something just dosen't add up.
Agreed.

Is the OP using a capacitor(s). Sounds like you might not be. Capacitors are great for smoothening the current, reducing ripple, and suppressing spikes.

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post #10 of 56 Old 01-14-2019, 10:17 PM
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Quote:
Originally Posted by strtch5881 View Post
Hi all.
i have added an led light and hand warmers to my machine, but I keep blowing the led lamp. I have followed the tutorial on this site and checked the wiring 4 times now. Testing shows 18.6 vac to the rectifier, but, 45.3 vdc coming out of the rectifier. I have tried 2 different full wave rectifiers from different companies with the same result. Any thoughts?????
Do you have a pic or model numbers of the rectifiers you have used??? Almost sounds as if it's wired incorrectly somehow. What are you using for a ground?? Is it the engine block?? Using factory connectors?? Can you supply a wiring diagram of how you presently have it wired??

What are you using for an LED Bulb??

Those are wacky numbers,,,,,Can't say I've ever seen results like that.


GLuck, Jay
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