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#1
10-04-2011, 08:49 PM
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Weird electrical event 85 TD
Driving home from work on the expressway today I lost all electrical power. No electrical instruments, no windows, no turn signals but also no warning lights. Continued for about 8 miles. Then it all returned. Anyone have an inkling as to the source of the problem? Ignition switch? Battery terminals? I'm leaning towards the ignition switch. I'm thinking that if I lost a connection at the battery I would have gotten a battery no charge light on the dash? With the ignition switch off, none of those things would normally work, which I why I'm leaning in that direction.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 
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#2
10-04-2011, 09:10 PM
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Quote:
If your ignition switch went off then the idiot light would come on as it would be trying to power the ignition circuits. If you turn the key off with no vac, the idiot light comes on. You could have had an earth strap problem or a fuse that had a bad connection. When things warm up & dry out strange electrical things happen.
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort....  1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles  1987 250td 160k miles English import  2001 jeep turbo diesel 130k miles  1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving
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#3
10-04-2011, 09:24 PM
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I lean towards switch, too. If the battery lost it's ground, the spinning alternator would keep power until the diodes blew. I don't think the alternator can lose its ground. Never heard of that happening.
One way to isolate the key switch would be to check circuits that don't rely on the key switch. Did the clock stop over those 8 miles? On the expressway you'd have lost about 8 minutes. Did you check the dome lights? Sixto 87 300D
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#4
10-04-2011, 09:36 PM
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Didn't think to check the dome light, that would have been an ideal test since it's not dependent on the ignition switch. It was too light to check the headlights. I didn't notice if the clock lost time and I'm not sure it was at exactly the correct time so I can't look at it now.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#5
10-04-2011, 11:23 PM
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Sun spot flare up?
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Cheers! Scott McPhee 1987 300D
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#6
10-04-2011, 11:34 PM
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A few years ago my 240 would blink out power. It turned out that one of the terminals on the starter was loose. I took the wire off, tightened the terminal, put the wire back on, and the problem disappeared.
I had previously checked all the battery and chassis connections and those didn't fix it.
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Andrew '04 Jetta TDI Wagon  '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#7
10-05-2011, 08:18 AM
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About two weeks ago I was driving the 240 to work and halfway there I was surprised to see the battery light come on. When I got there, I shut it down and tried to restart but got nothing at all. I popped the hood and to my surprised the positive side cable was completely off the terminal . . . just wasn't tight enough and slowly just worked its way off I guess.
So, may not be that extreme, but perhaps some poor connection someplace. Is your battery light working otherwise that it would come on if that was the case?
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'95 E300D ("Tank") - 231,000 miles '79 240D ("Biscuit") - 197,250 miles (Sold) '83 240D ("Ding-Ding") - 217,000 miles (Death by deer) ______________________________________ "Back off, man. I’m a scientist” ~ Peter Venkman
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#8
10-05-2011, 09:34 AM
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Quote:
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#9
10-05-2011, 09:35 AM
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Quote:
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#10
10-05-2011, 09:36 AM
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there is a socket above and to the right of the accelerator pedal, if it's loose, the exact situation will happen in an SD... also, the ignition switch will NOT start the car when this connector comes loose.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!! 1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#11
10-05-2011, 09:37 AM
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Quote:
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#12
10-05-2011, 10:17 AM
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what about fuses? I had something similar happen in my 85TD and after I rotated all the fuses it was back to normal.
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08 R320 CDI current Past 95 E420 87 300D Turbo 5spd 90 300TE 83 300SD 85 300TD 92 400E 85 190D
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