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Re: 49 3100 gas gauge
rad #1409936 Fri May 14 2021 10:38 PM
Joined: Mar 2010
Posts: 610
B
Curmudgeon
One more question Andy. Usually when a component burns/fails like the regulator chip, it emits a strange smell maybe something like melting wire insulation. Did you notice anything like that?

Re: 49 3100 gas gauge
rad #1409937 Fri May 14 2021 10:44 PM
Joined: Dec 2013
Posts: 1,013
'Bolter
Unfortunately, I don't recall any strange burning smell in either configuration.


Andy

His: 1947 Chevrolet 3104 [flic.kr]
Hers: 2008 American Saddlebred [flic.kr]

"I proudly Stand for the Flag and Kneel for the Cross" Unknown
Re: 49 3100 gas gauge
rad #1409954 Sat May 15 2021 03:36 AM
Joined: May 2005
Posts: 8,336
B
Sir Searchalot
I think the poster has left the building.................. and I don't blame him.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
I used to think beer was bad for me, so I gave up thinking.
Sometimes no nonsense makes sense, in a sense.
You can't teach a new dog old tricks.
Honk if you're Amish


Re: 49 3100 gas gauge
rad #1409992 Sat May 15 2021 05:18 PM
Joined: Mar 2014
Posts: 2,481
J
'Bolter
The zener diode is a good choice for something like this...and actually with a fuel gauge, you don't need an elephant gun to shoot a mouse. Just like Ohm's Law and other things electronic, explaining the zener can get complex, but here is a tutorial I think does a nice job of it:

https://www.electronics-tutorials.ws/diode/diode_7.html

Once established correctly a zener diode ought to last and work for a long time. And they're not expensive. I'll reserve comments about the other products out there, but honestly speaking...at least in my experience...the best, simplest and longest lasting (about 1 week past forever) 12 to 6 volt converter of all was the Vol-Ta-Drop. Unfortunately they stopped making them over 20 years ago. If you can find one, get it. Most people who still own one would be very hesitant to sell it.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: 49 3100 gas gauge
rad #1409999 Sat May 15 2021 06:25 PM
Joined: Jul 2000
Posts: 1,311
G
Insomniac
For about $10 (Amazon), you can buy a 12/24V DC to 5V DC converter. It would probably do the trick*. Just have to cut off the USB connector and add ring terminals.

*not sure how much current flows through a gas gauge.


Gord
----
1954 1/2 ton 235 4 speed
Re: 49 3100 gas gauge
Gord&Fran #1410064 Sun May 16 2021 06:04 AM
Joined: Mar 2014
Posts: 2,481
J
'Bolter
2 amps or a bit less for the most hungry ones and some are only about a quarter of that. Once I have a bit of time, I'll see about making one (similar to what I did with the condenser replacement). This is a very simple thing which would only require a small bit of cost.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: 49 3100 gas gauge
rad #1410080 Sun May 16 2021 01:44 PM
Joined: Dec 2013
Posts: 1,013
'Bolter
I found this article from jalopyjournal.com (H.A.M.B.) kind of interesting. It's over 11 years old.

How to Build a Voltage Regulator for $3 [jalopyjournal.com]


Andy

His: 1947 Chevrolet 3104 [flic.kr]
Hers: 2008 American Saddlebred [flic.kr]

"I proudly Stand for the Flag and Kneel for the Cross" Unknown
Re: 49 3100 gas gauge
rad #1410086 Sun May 16 2021 02:34 PM
Joined: Feb 2019
Posts: 2,102
P
AD Addict
Nice, easy to follow article on how to build them. Thanks Andy!

Not that I need one, but if I did (not being an electronics guy), sourcing parts on an individual basis, looked to be somewhat pricey. If you were to build ten you could build them cheap, but I couldn’t find decent pricing on individual pieces.

Last edited by Phak1; Sun May 16 2021 02:35 PM.

Phil

1952 Chevrolet 3100
Project Journals
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‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: 49 3100 gas gauge
rad #1410147 Mon May 17 2021 12:37 AM
Joined: Mar 2010
Posts: 610
B
Curmudgeon
Two things about the Runtz.
* It's mounted on one end on the post of the gauge. If it has a circuit board, typical truck vibration could cause a small crack. Epoxy encasing may be needed.
* If I was in the business, I would want the defective units returned to determine what component failed and revise the design.

Voltage surge.
Operating a 6 volt, series wound (if I remember correctly) starter motor with 12 volts works but I don't know if this increases voltage surge. In any case, a protected auxiliary panel/box connected directly to the battery is probably a smart thing to do for providing power for all add-on solid state devices (today's tech electronics).

Power supply info (tech school stuff).
* Dropping resistor = Poor regulation.
* Resistor voltage divider = Basic regulation. Good regulation if input voltage is constant.
* Zener diode = Good regulation. Correct resistor(s) and capacitor(s) have to be calculated.
* 3 pin/leg regulator = Great regulation. Resistor(s) and capacitor(s) require no/minimal calculation. Built-in overvoltage, overcurrent and thermal protection.

Re: 49 3100 gas gauge
rad #1410153 Mon May 17 2021 01:07 AM
Joined: Dec 2013
Posts: 1,013
'Bolter
Rusty, I suppose we've completely hijacked this thread by most reasonable standards. However, there's a lot of really good information coming to the surface. Let us know if you want a new thread started on 12V to 6V regulators.

I thought I was grasping the Zener Diode with resistor(s) configuration, but the introduction of capacitor(s) has me scratching my head. Does the capacitor store excess voltage? I'm even more curious about the 3 pin/leg regulator with buoymaker's 'Great regulation' listing.

Could you resident electrical wizards (and you know who you are) walk us through these circuits from the battery to the gas gauge?


Andy

His: 1947 Chevrolet 3104 [flic.kr]
Hers: 2008 American Saddlebred [flic.kr]

"I proudly Stand for the Flag and Kneel for the Cross" Unknown
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