WF 8955 converter 12 volt fue panel problem

mike-s wrote:

MEXICOWANDERER wrote:
5 MILLI amps of bleed can cause a 5-volt potential exist in a switched buss, try it with reality instead of a calculator and sharp pencil.

Do you have a coherent point? To get a 5 volt source to move 5 mA, the resistance would be 1000 ohms. Any voltmeter is magnitudes higher, as I said, 10,000,000 is common. Not that that has anything to do with anything - you claimed putting a voltmeter across the (bad) fuse would kill the LED. It won't. You only know enough about electronics to be dangerous, as you prove time and time again in your unique form of gibberish.

I think both of you are doing a discredit to the OP and readers and haven't taught anybody ****. Maybe stroked your ego a little. He didn't ask anything like that. You guys are having a tech discussion within general questions about simple stuff and look like idiots to us trying to learn the ANSWER TO THE EFING QUESTION THAT WAS POSTED. I'd start with teaching how to use a multi meter. How helpful would that be?

mike-s wrote:

MEXICOWANDERER wrote:
5 MILLI amps of bleed can cause a 5-volt potential exist in a switched buss, try it with reality instead of a calculator and sharp pencil.

Do you have a coherent point? To get a 5 volt source to move 5 mA, the resistance would be 1000 ohms. Any voltmeter is magnitudes higher, as I said, 10,000,000 is common. Not that that has anything to do with anything - you claimed putting a voltmeter across the (bad) fuse would kill the LED. It won't. You only know enough about electronics to be dangerous, as you prove time and time again in your unique form of gibberish.

Having a bad morning? Have another cup of Joe lol.

MEXICOWANDERER wrote:
5 MILLI amps of bleed can cause a 5-volt potential exist in a switched buss, try it with reality instead of a calculator and sharp pencil.

Do you have a coherent point? To get a 5 volt source to move 5 mA, the resistance would be 1000 ohms. Any voltmeter is magnitudes higher, as I said, 10,000,000 is common. Not that that has anything to do with anything - you claimed putting a voltmeter across the (bad) fuse would kill the LED. It won't. You only know enough about electronics to be dangerous, as you prove time and time again in your unique form of gibberish.

I got the new panel and it solved the problem

5 MILLI amps of bleed can cause a 5-volt potential exist in a switched buss, try it with reality instead of a calculator and sharp pencil. 3mm LEDs are incredibly prone to lighting up at voltages that are outrageously low. Having built so many indicator panels with LED and piezo annunciators taught me a lesson in reality.

Good meters have high impedance. But when a dime store meter cancels a ganged bleed of (one LED) it will have you scratching your head -- have fun :)

MEXICOWANDERER wrote:
A simple voltmeter voltage check across that fuse should kill the LED 5-volts potential is more than enough to fire a 3mm LED with resistor.

Nonsense. Voltmeters are high impedance. 10M is common, even for the free-with-purchase Harbor Freight ones. Even the ancient and cheap ones with a needle display are usually 20K or more.

Ok, believe it or not you posted most everything I need to figure it out.. I have a progressive Dynamics panel. works same way But it is a "Stand Alone" panel.

First the RED LIGHT (LED) are you sure you are checking the correct fuse? Also sometimes an LED may be there for reasons other than blown fuse indication.

On my PD panel the LED's do not line up exactly and as A result I always have to check TWO fuses when I blow one.

As for the 10 volts

The way the LED's work is like this....

Batt---fuse-----------------------load
Batt---LED--Resistor--------------Load

That to say the LED and it's pass resistor are in PARALLEL with the fuse.

What you are seeing is voltage passed by the LED when the load is off.
Turn the Load (IE: LIght) on and that voltage should go to ZERO unless the light is also an LED.

Bad fuse panel would be rare and surprising. We might not hear from him again but I still have doubt.

Psychic troubleshooting always has had a few glitches...

Thanks for the resolution. Not sure we could have found that definitively.