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  #1  
Old 09-12-2013, 11:42 PM
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1976 W114/115 300D not starting

Okay, so I purchased this car last Sunday for a grand.
Ran beautifully, had a little trouble getting started but with a new battery did fine.

Got it home, turned off and it wouldn't come back.
Hooked a charger up to it with the engine start mode and it fired up , but then that charger broke.

Other night had it hooked with the jumpers to the f250 diesel and it would turn over, quick too, but just wouldn't fire up.
Now I purchased another charger, and let it charge, now the car wont even turn over.

Battery light stays on until the battery drains itself.

I turn the key, glow plug light lights up, goes off after 20 seconds or so and I go to start an click, nothing now.
I'll see a spark come off the battery, also after that I'll have to push the battery a little get the connection again.

I was thinking internal voltage regulator.
Checked fuses, they all look decent, or connected at least.

Any suggestions?

Last edited by whunter; 09-13-2013 at 12:04 AM. Reason: spelling, readability
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  #2  
Old 09-13-2013, 12:06 AM
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Answer

Sounds like a bad connection at the battery terminal has blown the voltage regulator.

you may find this thread useful and interesting.
Welcome to the fleet 1976 W115.114 "300D" dark Green


.
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Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
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1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D

Last edited by whunter; 09-13-2013 at 12:25 AM.
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  #3  
Old 09-13-2013, 12:15 AM
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you can blow those ? like the brushes ? I tried removing it but the tiny little flat head screws are sucha ***** to get off. especially with not alot of room in their. The wires going to the regulator were frayed a little and exposed metal, could it have grounded out on the alternator ?
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  #4  
Old 09-13-2013, 12:38 AM
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Answer

Quote:
Originally Posted by Bugeye_WRX View Post
you can blow those ? like the brushes ? I tried removing it but the tiny little flat head screws are sucha ***** to get off. especially with not a lot of room in their. The wires going to the regulator were frayed a little and exposed metal, could it have grounded out on the alternator ?
Yes, a loose battery connection on a running engine can blow the voltage regulator.

Grounding the wrong alternator wire to the case can blow the voltage regulator.

Pictures of the wired damage, may help diagnosis.

I agree, the screws are a PIA in the tight space, IMO it is slightly easier to remove the alternator and work on a bench.

.
__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Prototype Vehicle build.
Prototype Fleet Durability
Prototype vehicle instrumentation.
Technical Quality Auditor.
Automotive Technical Writer

1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D
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  #5  
Old 09-13-2013, 12:42 AM
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FYI

You really need to read this
I have documented many issues on my daughters 1976 300D in this thread.
Welcome to the fleet 1976 W115.114 "300D" dark Green

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__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Prototype Vehicle build.
Prototype Fleet Durability
Prototype vehicle instrumentation.
Technical Quality Auditor.
Automotive Technical Writer

1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D
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  #6  
Old 09-13-2013, 01:18 PM
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Would having a blown voltage regulator prevent it from starting ? Even with a fully charged battery
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  #7  
Old 09-14-2013, 12:56 AM
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Answer

Quote:
Originally Posted by Bugeye_WRX View Post
Would having a blown voltage regulator prevent it from starting ? Even with a fully charged battery
No.
Odds are there is a glow plug or valve adjustment issue.
Seriously plugged fuel filters can also be a factor.

.
__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Prototype Vehicle build.
Prototype Fleet Durability
Prototype vehicle instrumentation.
Technical Quality Auditor.
Automotive Technical Writer

1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D
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  #8  
Old 09-14-2013, 10:34 AM
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The glow plug light comes on, yet I don't here any click or noise from the relay, would the light come on if there was a problem? I'm about to replace all the inline filters and do a valve adjustment also probably switch over to the pencil type plugs, I'll let yah know how it goes
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  #9  
Old 09-16-2013, 06:33 PM
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But now that it wont even turn over, it just clicks , you could assume its the starter ?
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  #10  
Old 09-16-2013, 08:26 PM
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Okaay so I'm dumb and just realized the ground cable looked a bit corroded , re did the wire , started right up! Now onto the preventative maintance
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  #11  
Old 09-16-2013, 08:57 PM
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Quote:
Originally Posted by Bugeye_WRX View Post
Okaay so I'm dumb and just realized the ground cable looked a bit corroded , re did the wire , started right up! Now onto the preventative maintance
If the ground or positive wire are bulging from corrosion....I would replace them....well matter a fact..... I would upgrade them now to a thicker gauge....call it preventive maintenance...
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  #12  
Old 09-17-2013, 08:14 AM
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Okay so went to start this morning and no glow plug light, bot sure if maybe the battery just doesnt have enough juice to do it . When I crank it the gp light will comeon an it'll crank but no start .. Can I think it doesnt have enough power or replace gp's
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