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Old 01-15-2007, 08:38 PM   #1 (permalink)
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Voltage Regulator...how does it work?

Trying to figure out exactly how a voltage regulator works. Does it restrict the voltage by a certain percentage? Or does it cut it down at 12.8 V?
Is there a way to measure resistance to see if a voltage regulator is still good or not?
My Voltage Regulator is measuring at 800 Ohm. I'm getting 6v to the headlight, and when the voltage regulator is disconnected I'm getting 18v at a low idle (didn't rev it up to test it).
Any ideas or answers?
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Old 01-15-2007, 11:09 PM   #2 (permalink)
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no exactly sure if it works on a percentage base, but 6V is too low, check wiring and grounds then take another reading, if its the same replace it.
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Old 01-15-2007, 11:58 PM   #3 (permalink)
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VR's Have 2 basic functions in a sled 1 turn AC to DC 2 to attempt to keep the voltage within a predetermained range. I have a few Questions for you first prior.

1. where are you taking your resistance readings from and to.

2. Where are you taking your volt readings form and to.

3. Are the readings AC or DC

Many off road voltage regs. have a cut off at 14vdc on the output under no load. This is often performed via a transistor. The conversion of ac to dc is accomplished by the use of a bridge rectifier made of diodes.
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Old 01-16-2007, 07:52 AM   #4 (permalink)
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One note to that is it will be dc voltage if the sled has a battery otherwise most sleds put out ac voltage and they dont bother with a rectifier.
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Old 01-16-2007, 08:01 AM   #5 (permalink)
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Quote:
Originally Posted by mmrosshere
Many off road voltage regs. have a cut off at 14vdc on the output under no load. This is often performed via a transistor. The conversion of ac to dc is accomplished by the use of a bridge rectifier made of diodes.
Wow, You sound like you know what your talking about. Personally I'm a micro electronics technician and when I saw this I got a little excited. Props to you.
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Old 01-16-2007, 04:05 PM   #6 (permalink)
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Quote:
1. where are you taking your resistance readings from and to.

2. Where are you taking your volt readings form and to.

3. Are the readings AC or DC
1. Resistance readings are taken between Positive wire off the VR (Single wire voltage regulator) and the ground tab where the regulator bolts to the frame.
2. I'm using the headlight plug for my voltage readings. The ground, and the Low Beam wires.
3. Readings are AC

The reason why I'm asking all these questions, is because it seems strange that a voltage regulator would cut back voltage TOO MUCH. But when I unplugged the voltage regulator, I was getting lots of power to the headlight plug, which makes me assume that the lighting coil is putting out enough power. UNLESS, a voltage regulator cuts back power by a percentage somehow, which could mean that the lighting coil is weak.....I guess.....I don't know...that's why I'm here.
Any other types of tests I can do to see if it is indeed the VR or the Lighting Coil? I've got a co-worker going to look for a spare VR he has lying around somewhere, but it could be a while till he gets the time to look for it.
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Old 01-16-2007, 06:05 PM   #7 (permalink)
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It could be your reg or it could be a drain on something connected to it. Did you disconect the wires from the output of the reg and check the volts then.
I just had a simular happening. My headlight was bright during idle then when I raised the rpms the light would dim. turns out that the heated grips had a break over voltage so they were not on during idle. When it got over 12.5v it opened and sent the current through to the heaters. The heaters were shorted to ground there by drawing all the current from the lights. then when I hit the brake light the V would drop bellow 12.5v and the grips would shut off. I would have a bright headlight once more. I just found that today.
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Old 01-16-2007, 06:47 PM   #8 (permalink)
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WoW! Good find!!
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Old 01-16-2007, 07:03 PM   #9 (permalink)
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Well once I got the kid off it. Yes she came home before dark. I pulled out the trusty Fluke 77 and went to traceing lines. I knew the new led tail light was good but every thing else was a cob job by previous owners.
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Old 01-16-2007, 07:17 PM   #10 (permalink)
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Thanks mmrosshere... You just solved my light problem on a old 84 indy i've been messing around with......

Last edited by wtwe2step; 01-16-2007 at 07:33 PM.
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Old 01-16-2007, 07:23 PM   #11 (permalink)
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Well Glad to hear.
WE are all here to help , be helped and enjoy.
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Old 01-17-2007, 10:26 PM   #12 (permalink)
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Well, the light problem is solved. Coworker gave me another voltage regulator and as suspected, that solved the problem.
Just for information purposes, the resistance on the BROKEN regulator was about 800 OHMS, and the resistance on the GOOD regulator was 100 OHMS.
Now.....just have to try and track down the tach problem....
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Old 01-17-2007, 10:59 PM   #13 (permalink)
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Excellent Glad to know all that skouling did not go to waste now that I set tile and stone for a living. What sled was that on so I can use that as a future referance? If you don't mind.
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Old 01-18-2007, 01:52 PM   #14 (permalink)
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