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  #1  
Old 12-29-2018, 04:04 PM
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Join Date: Jan 2012
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Found a good looking add on volt / amp meter

Not sure how accurate but good enough to monitor the charging system on a car. The meter overall dims are 1 inch x 2 inches so the display will be kind of small but good enough. At some point I want to add one to my battery charger.

If you got another shunt and a selector switch, you could monitor glow plug current and get an instant indication that one is burned out. ( If the GP are in parallel )

$ 18.00 now, on sale for an unknown period of time $ 13 . They have lots of other meters and much more in the way of electronic goodies.

https://www.mpja.com/Mini-Panel-Meter-Dual-Red-LED-Display-30-Volts-100-Amps-DC/productinfo/32063+ME
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  #2  
Old 12-29-2018, 07:50 PM
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Just a warning...they don't like add-on meters here. Sorry.

https://www.peachparts.com/shopforum/tech-help/379019-every-single-one-you-needs.html
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  #3  
Old 12-29-2018, 10:08 PM
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Join Date: Aug 2018
Posts: 70
Oh boy! Marlin P Jones is still out there kicking! Almost 30 years ago their operation was once located right next door to a warehouse condo I owned in Riviera Beach. Great people and a great operation, they always had some of the coolest stuff if someone is a tinkerer or an inventor type. I'm still using a tube of Tef-Gel I bought to use on aluminum boat stuff all those years ago. Small world.

Quote:
Originally Posted by 97 SL320 View Post
Not sure how accurate but good enough to monitor the charging system on a car. The meter overall dims are 1 inch x 2 inches so the display will be kind of small but good enough. At some point I want to add one to my battery charger.

If you got another shunt and a selector switch, you could monitor glow plug current and get an instant indication that one is burned out. ( If the GP are in parallel )

$ 18.00 now, on sale for an unknown period of time $ 13 . They have lots of other meters and much more in the way of electronic goodies.

https://www.mpja.com/Mini-Panel-Meter-Dual-Red-LED-Display-30-Volts-100-Amps-DC/productinfo/32063+ME
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  #4  
Old 12-29-2018, 11:05 PM
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Dieseldiehard
 
Join Date: Oct 2002
Location: Bay Area No Calif.
Posts: 4,195
that MP Jones meter is certainly cheap! I would not hesitate to put it in a motor home or HUMVEE or some military vehicle but to me its a bit too much for a Mercedes at least any that I drive. I do like the idea of monitoring GP current though!
That said, I use something to monitor battery voltage that seems to be NLA, at least I couldn't find any after a thorough search.
It is a small device with a couple of cigarette lighter outlets that is hardwired to 12V (I connected in parallel with the tilt-out lighter socket in the W210 car.

Of note is the feature it has where three small LED's indicate the state of charge: green, yellow and red.
These indicate analog values and are a quick indicator of whether your battery voltage is changing or low. A lot easier then reading a seven segment LED or LCD display.
And I could have used one in my '87 300D recently when my alternator started going out, I never saw the dash light come on but gradually voltage would drop to the point the car would be hard to start then a short trip and it died on me.
I attribute the early death of the 3 y.o. Bosch battery to a possible intermittent brush contacts. I am going to pull the alternator and will upgrade to a 115A one and then I'll take the regulator out and examine it to see if my theory is correct.

I mounted my nice charge indicating cig lighter outlet on the side of the console near the radio, where a laptop charger could be plugged in as well.
(Pics to follow)

Some newer cig outlets even have a USB port. One I saw featured a bright blue LED that lit up for whatever reason - this is not what I recommend, driving at night with a bright blue light in my face is not my cup o' tea!

There is something about the European cig lighters in Mercedes that leaves me hating them because I have seen them not make good contact to available cigarette lighter plugs.
Anyone else had that problem?
DDH
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'00 E320 (wifes car), '95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
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  #5  
Old 12-30-2018, 10:50 AM
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Quote:
Originally Posted by dieseldiehard View Post
That said, I use something to monitor battery voltage that seems to be NLA, at least I couldn't find any after a thorough search.
It is a small device with a couple of cigarette lighter outlets that is hardwired to 12V (I connected in parallel with the tilt-out lighter socket in the W210 car.
MPJ has some volt meters that plug into the lighter socket, I didn't look for the type you describe.

Also, mid / late 90's MB have a function to look at HVAC data that includes battery voltage. With the HVAC blower running and key on, press and hold " REST " , the display will change to a " 01 " then flash a value. Use the fan " + " and " - " button to scroll through the data. I think battery voltage is 06 or at least in that area. Voltage will be a few tenths below actual battery due to voltage drop through the wiring but it is close enough.

Quote:
Originally Posted by dieseldiehard View Post
Of note is the feature it has where three small LED's indicate the state of charge: green, yellow and red.
These indicate analog values and are a quick indicator of whether your battery voltage is changing or low. A lot easier then reading a seven segment LED or LCD display.
The do sell an analog / digital meter. Yep,a light or analog display is better in getting your attention and digital for an actual reading.


Quote:
Originally Posted by dieseldiehard View Post
There is something about the European cig lighters in Mercedes that leaves me hating them because I have seen them not make good contact to available cigarette lighter plugs.
Anyone else had that problem?
DDH
The euro and some newer domestics use a shallow socket, use an older plug with the ground contact strap pretty high up and it will fall out. I remember seeing an adapter to cure this. Newer lighter plugs have a longer ground strap to fix the problem.
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  #6  
Old 12-30-2018, 10:53 AM
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Quote:
Originally Posted by if6was9 View Post
Oh boy! Marlin P Jones is still out there kicking!
Yep, there are still a few electronic surplus / goodie stores around. Have a look at Sciplus sciplus.com for goodies. Have a look at the old hand drawn product pics, I expect them to go away at some point.
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