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#1
07-03-2012, 07:29 PM
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Electrical deamon fuse 13 '83 300SD W126
Hello again gents,
I'll give you the unabridged version of my troubles. It started out a few days ago. I swapped my aux fan for a larger one and went for a test drive. Yes, fuse 13 has logically nothing to do with the aux fan. I proceeded out of the parking lot when I casually went over a speed bump and my radio went dead. I thought, awwwwe fack, fuse blew. It did. number 13 was replaced immediately and upon then next speed bump, it blew again. I thought there was a wire shorting out to ground somewhere, so I didn't replace the fuse again until a day later. Same thing. On the way to work, I hit bump and the fuse blew again. On lunch break I attempted to replace the fuse with the engine running and it blew while I was installing it. It continues to do so currently. I decided to remove everything I can that is powered by that fuse and try installing a new fuse and connecting devices one-by-one. I disconnected everything but the central locking system and fuse still blows as soon as I connect it. I don't know anything about the central lock system and it has never worked since I bought the car. In lieu of disconnecting the locking system, I decided to disconnect everything else on the circuit and test for continuity, ohms, and amps between the two #13 terminals. I get nothing on any of the tests. The meter reads 0 for all three tests. I jumped the terminals with a screw driver for about 3 seconds with the hazard flasher switch on and they did activate. I just don't understand what could be the cause of this; with everything removed but the lock system, how could I not get an ohm, amp or continuity reading if it blows fuses constantly? I am stumped! I'm about ready to wedge a piece of steel in fuse holder and wait for something to start smoking to find my problem. If it were a short to ground, I should have gotten a reading in the tests, right? Any advice is appreciated!
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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors. 2003 S430 - 107K 1983 300SD - Tanoshii - mostly restored ~400K+. 1983 300SD - Good interior. Engine finally tamed ~250K. Monark Nozzle Install Video - http://tinyurl.com/ptd2tge 
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#2
07-03-2012, 09:18 PM
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Use a brake light bulb in place of the fuse. It will give you a safe series impedance to find the fault.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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#3
07-04-2012, 11:32 AM
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Does anyone know where and what connectors I can pull to disable the central locking system?
I'll try the brake light bulb as well. Thanks Jay.
__________________
1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors. 2003 S430 - 107K 1983 300SD - Tanoshii - mostly restored ~400K+. 1983 300SD - Good interior. Engine finally tamed ~250K. Monark Nozzle Install Video - http://tinyurl.com/ptd2tge
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#4
07-04-2012, 11:39 AM
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I'll check the vacuum pump in the trunk. I currently have it removed so maybe something fell on the connector and is shorting out. I think there is more to the system, though.
__________________
1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors. 2003 S430 - 107K 1983 300SD - Tanoshii - mostly restored ~400K+. 1983 300SD - Good interior. Engine finally tamed ~250K. Monark Nozzle Install Video - http://tinyurl.com/ptd2tge
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#5
07-04-2012, 12:47 PM
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I found it!! I was right, it was the vacuum pump wire. It found its way under the spare tire, got crushed and was grounding out on the frame. I have the trunk carpet out right now because some day I plan on fixing some rust holes in the wheel wells.
I replaced the fuse and took her for a drive and everything is fine again.
__________________
1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors. 2003 S430 - 107K 1983 300SD - Tanoshii - mostly restored ~400K+. 1983 300SD - Good interior. Engine finally tamed ~250K. Monark Nozzle Install Video - http://tinyurl.com/ptd2tge
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#6
07-04-2012, 12:52 PM
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__________________
1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors. 2003 S430 - 107K 1983 300SD - Tanoshii - mostly restored ~400K+. 1983 300SD - Good interior. Engine finally tamed ~250K. Monark Nozzle Install Video - http://tinyurl.com/ptd2tge
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