Home   Forum   Classifieds   Tech/DIY   News   Articles   Chat   Contact Us

12v accessory circuit problem.

Tech forum for DIY, repairs, restoration, problems, questions, etc... Post here get answers!
User avatar
cal_w460
Posts: 1480

Re: 12v accessory circuit problem.

Post#11 » Wed Mar 27, 2019 12:50 am

Why would the blinker switch break after he added a 12V circuit?

If things burn up after you add a 12V accessory circuit you must have managed to somehow get +12V to connect with 24V ground, or the other way around. A shorted circuit. I dont think that 12V+24V (36V) would kill any of these components. If thats what happened.

Could you draw a simple diagram of how you connected these circuits? To be, the best thing would be if the new accessory circuit didn't share anything at all with the existing system. No ground through the chassis etc. But separate ground wires to each component.

Or do you mean that the problem existed before?
w460.333 1982 Colorado Beige 300 GD OM617.931

User avatar
Atl-Wagen
Posts: 311
Contact:

Re: 12v accessory circuit problem.

Post#12 » Wed Mar 27, 2019 2:53 am

Oh yes! I was looking for an excuse to take the dash apart. (there may be sarcasm) But still, does anyone have a wiring diagram for the 461?
Back on the Wagen, in an 88 Danish Army SWB soft top with the folding windshield.

User avatar
Fernando BR
Posts: 1829

Re: 12v accessory circuit problem.

Post#13 » Wed Mar 27, 2019 4:33 am


User avatar
cal_w460
Posts: 1480

Re: 12v accessory circuit problem.

Post#14 » Wed Mar 27, 2019 6:04 am

You could start troubleshooting by disconnecting both the 24V batteries and 12V battery. Then do resistance measuring with a multimeter between an existing ground point and all possible parts of your 12V accessory harness. To see if there is a short circuit to ground from any of its components.

How do you intend to charge the 12V battery? Solar panels?
There shouldn't be any connection at all between the two circuits in the way you want it to work right?
w460.333 1982 Colorado Beige 300 GD OM617.931

User avatar
tpond
Posts: 70
Contact:

Re: 12v accessory circuit problem.

Post#15 » Wed Mar 27, 2019 7:07 am

This does not help your current problem, but for charging your phone you can use this without any modifications: https://www.amazon.com/gp/product/B00QM ... UTF8&psc=1

User avatar
Atl-Wagen
Posts: 311
Contact:

Re: 12v accessory circuit problem.

Post#16 » Wed Mar 27, 2019 1:14 pm

Fernando BR wrote:May be you can find here

http://www.en.mercedes-wolf.pl/manuale-serwisowki/


oooooo i can't read it but the pictures sure are nice!
Back on the Wagen, in an 88 Danish Army SWB soft top with the folding windshield.

User avatar
Atl-Wagen
Posts: 311
Contact:

Re: 12v accessory circuit problem.

Post#17 » Sun Mar 31, 2019 11:13 am

The correct answer was fuses and bulbs. Odd. Very odd.

What is the secondary bulb in the headlight housing supposed to be? Both of mine are missing. Any ideas on color or bulb size?
Back on the Wagen, in an 88 Danish Army SWB soft top with the folding windshield.

User avatar
Atl-Wagen
Posts: 311
Contact:

Re: 12v accessory circuit problem.

Post#18 » Sun Mar 31, 2019 12:26 pm

30FB06D2-2CC0-4B0A-ADAB-3F8BF3797469.jpeg
Lights fixed
Back on the Wagen, in an 88 Danish Army SWB soft top with the folding windshield.

User avatar
cal_w460
Posts: 1480

Re: 12v accessory circuit problem.

Post#19 » Sun Mar 31, 2019 12:48 pm

Nice G! Glad that the electrical problem had such a simpe solution. Secondary bulbs in the Hella H4 headlights are the parking light.
w460.333 1982 Colorado Beige 300 GD OM617.931

User avatar
Atl-Wagen
Posts: 311
Contact:

Re: 12v accessory circuit problem.

Post#20 » Sun May 26, 2019 6:14 am

Well the dash is out, getting ready to blast and paint the floor board. In the category of “learn something new every day”. The large switch under the dash is a ground kill switch, as the frame ground does not work unless the switch is thrown. Would anyone care to confirm that?

The bolt sticker is certainly not OE.

Added an accessory fuse block for the clock and future radio then moved the 12v to 24v blower transformer added a relay.
Attachments
8D004A9A-7F4E-483C-9150-130057AE297A.jpeg
Aux fuse
C3B8359C-1A31-45FB-9E1E-A56129865353.jpeg
Kill switch
Back on the Wagen, in an 88 Danish Army SWB soft top with the folding windshield.

Return to “G Wagen Technical Forum”

Who is online

Users browsing this forum: Atl-Wagen, Baddy, Chris, dcurbet, difflock, dy5184, fofrh, Giel-G, GMarius, goat, Johnny Christensen, kafkaonwheels, Kashi123, Mercano, paulunm, ukiemarko and 12 guests