Blown Fuse - PeachParts Mercedes-Benz Forum

sailor15015 · #1 10-30-2005, 11:18 PM

Hello all,
I had started this thread before the crash but alas it seems as if it was lost. To recap what it said my #14 fuse has been continually and randomly blowing. On my model car this runs the various acc accessories, horn, and the reverse lights. The things I have unplugged to varify that they aren't blowing the fuse are the aux water pump, acc monovave(that's the one on the outside that lets coolant in the heater core, right?), and the acc unit itself. I don't think the reverse lights are the problem because they will stay on and I have never observed the fuse to blow just by putting it in reverse. Also run off of this fuse is the seatbelt warning buzzer which quit working so I unplugged it, thinking it might have shorted internally and was causing the fuse to blow. This did the trick for about a week but the problem showed up again yesterday. The fuse box lid says that there is also some sort of "emmision control" device run off of this fuse. Does anyone know what this is or what I might be overlooking? Sorry for the long post I just wanted to be thorough. Thanks so much for the help.

sailor15015 · #2 10-31-2005, 09:10 PM

Bump, and thanks in advance.

sailor15015 · #3 11-09-2005, 11:57 PM

Ok. So I think my problem just might be my reverse lights. It blew on me twice tonight the moment I put it in reverse. Can anyone think of what might be shorting out? Switch at the shifter, trannie, bulbs themselves? I'd love to hear from anyone who has even a hint of a suggestion before I just start randomly replacing parts. I'd like to have a plan of attack. Thanks in advance.

Jim H · #4 11-10-2005, 06:59 AM

Quote:

Originally Posted by sailor15015

...It blew on me twice tonight the moment I put it in reverse. Can anyone think of what might be shorting out? Switch at the shifter, trannie, bulbs themselves? I'd love to hear from anyone who has even a hint of a suggestion before I just start randomly replacing parts. I'd like to have a plan of attack. Thanks in advance.

If the switch is in the positive leg, there is likely a short to ground in the wiring between the switch and the bulbs. Try removing both lamps and checking resistance of the socket terminals to ground. One may be grounded, but both should not be.

Best I can come up with at this time.

sailor15015 · #5 11-10-2005, 07:56 PM

Thanks Jim. Tried them both to a good ground and didn't get any response from the voltmeter, and yes, it was set on ohms. Could the bulbs themselves be drawing too much current, enough to blow the fuses? Where is the reverse indicator switch, on the shifter or in the trannie? Thanks