How do I identify a resistor ?
 

Fried a resistor in a gas gauge. It is orange with the black end, and seems to hae an 04 on it and an I T something under that. It's fried. I would take this to Radio Shack to match up, but those days are gone.

Any help would be appreciated. It seems a shame to waste an otherwise good gauge.

pic pls.

+1

It would seem this is more likely a diode than a resistor. Pic would help as others have requested.

My money's on cap. 104 = .1 uF, black end is polarity..... ;)

http://forums.pelicanparts.com/uploa...1512941274.JPG

Best picture I can muster.

That’s a diode.

Yes... Glass diode!

Easy fix.

Blew up when I cut it out. maybe a

1K
40
04
IT?

It rolls around like that.

Yup, I lose.

physically broken?

1N4004 is popular diode. (is it N instead of k?)

And what is the idiot's guide ?

Yep, it blew up from a full reverse polarity episode. Shattered the glass.

2.29 on Ebay. Thanks guys.

I just checked my junk drawer. Sorry don't have any.

10 for $5 on amazon prime.

Just took a look. Found one in my spare parts bin - used, but it checks out okay with my meter. Send me a PM with your address and it can be on its way tmr if you want it.

https://uploads.tapatalk-cdn.com/201...795cfa7fc7.jpg


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Thanks Mark, I already ordered a few. Now I just have to be patient.

Do I need to use a heat sink on the wires while soldering ?

When I usually have a burnt up resistor it burns off the stripes and I have to find it on the schematics to see what the heck it was.

That does look more like a diode than a resistor though.

Solder carefully, they don't stand up well to excess heat. Use the bare minimum of time with the iron on the component, and use a heat sink.

Needle nose pliers with a rubber band to keep it shut will soak the heat. Between the solder joint and the diode.

Solder pencil, not a gun. ;)

Do you mean the "Nerd Perks" card?

Have you ever noticed the colored stripes on a resistor? On the left of the card it shows the resistor color codes.

This may be more helpful.

http://forums.pelicanparts.com/uploa...1512969354.jpg

No card, still remember:
Big Boys Race Our Young Girls But Violet Generally Wins.... and a few other less PC versions.

I have seen the stripes. It did not help for me that the diode was orange with black ''stripes''. It has been 45 years since I messed with any of that stuff. I assembled a Heathkit stereo, and that was about it. This is a big help for me, and I appreciate it.

Thanks, Guys.

bob brown rapes our young girls but violet gives willingly .

Bad boys rape our young girls, but violet goes willingly

The only thing you have to remember is "black brown" at the start.

The old GE MK IV control systems had a 4-20mA input section and the fuse was rated too high (0.5 amps). If you applied 24VDC to the circuit, the resister would blow, saving the fuse. I kept lots of the the correct resistors around. I would go to an electronics store, go to the precision bin and then use a meter to check and find the ones that were PRECISELY 250 ohms. These were 1/4 Watt resistors.

I'd assign an electrical tech and a few minutes later, everything was working.

Alligator clips can be used as a heat sink as well. As close to the soldering location as possible decreases the amount of heat hitting the component.

On an automotive gas gauge, a 12v 1N4742A 1W zener diode seems more likely. What did the gauge come off of?
https://www.ebay.com/itm/New-10-Pcs-x-1N4742A-1N4742-ZENER-DIODE-1W-12V-SALE/151138408274?_trkparms=aid%3D222007%26algo%3DSIM.M BE%26ao%3D1%26asc%3D20160908110712%26meid%3D353d02 363be44fca8e5eee5a6fb0f8eb%26pid%3D100677%26rk%3D3 %26rkt%3D30%26sd%3D221743500814&_trksid=p2385738.c 100677.m4598

I was taught a slightly more bawdy version:

Bad Boys Rob Our Young Girls But Violet Gives Willingly. :)

That looks a lot more like it Fint, but the numbers clearly read 40 04.

It's a Veglia Borletti gauge out of an 81 fuel injected Fiat Spider 2000.

Edit; Ordered a few anyway.

Just curious, did the diode swap work out?

And then the tolerance rates:
Gold
Silver
No color
.
"Get Some?" "No."

Jingles are great for bad a memory, eh?

I was only taught the less PC version...Willingly

Forceps work well too if you have some handy.