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Old 11-13-2018, 11:48 PM
Jay Gibbs's Avatar
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Join Date: Jul 2000
Location: US
Posts: 328
1987 300TD Electrical Problem...

Have encountered an electrical problem with my 300TD that may have it's roots in a problem I've had for a couple years...

For about the last two years, the exterior lamp failure dash light has been illuminating the instant I turn my parking lights on. I have checked outside countless times and there were not any exterior lights blown.

Fast forward to a week ago- the dash cluster nighttime illumination lights stopped working. Initially I thought the rheostat was broken. Then I noticed the right side front and rear marker lights AND the headlight wipers had stopped working. Aha!...must be a fuse...lo and behold the #3 fuse was blown. I replace it and confirm the dash cluster and side marker lights work properly...for about 10 seconds...and the fuse blows again. I replace the fuse a second time, and this time it blows immediately with a flash.

Is there a relay in the lamp monitor system somewhere that could possibly be causing ALL these problems??


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Old 11-14-2018, 12:25 AM
Diseasel300's Avatar
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Join Date: May 2016
Location: Texas Hill Country
Posts: 5,837
I had a similar issue on my SDL. The wiper motor on the right hand side was the issue, there's a control circuit that pukes in it and causes a dead short. Insta-blows the fuse, which is annoying because it takes out the marker lights! I unplugged the wiper motor on that side and haven't had a problem since.
'11 Honda Accord EX - "The Daily" 73K
'91 560SEL - "Delta 88" 193K
'91 350SD - "Jest-D" 176K (Sold 12/20/20)
'94 BMW 525i - "The Red Car" 181k
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Old 11-14-2018, 01:43 AM
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Location: Newport News, Virginia
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Hopefully it's a seized electrical motor, but it's possible you have a short to ground. Look around areas of HEAT, VIBRATION and METAL contact. Sometimes wires will short out through a routing hole with a missing or non existent grommet.

1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

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