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1993 MB ignition switch no start
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lwilli4737
New User
Oct 17, 2012, 8:58 AM
Post #1 of 8
(1986 views)
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1993 MB ignition switch no start
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1993 300E 2.8L (124 028) 6 cyl eng. 104 86K miles
Engine will not start !
drove car to store, shutdown, came back 10 min. later and turned on ignition,
1. no click nothing happens.
2. turned on headlights OK
3. turned on radio OK
4.tried neutral gear no change of status
5.checked battery full charge 12.6 volts
6.heard relay buzzing unplugged and removed and replaced. no change still buzzing.
7.called tow truck and towed home.
8. checked for loose connections Ok
9. cannot find electrical drawing. please give me new suggestions please.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 17, 2012, 9:20 AM
Post #2 of 8
(1962 views)
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Re: 1993 MB ignition switch no start
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Before you go too nuts this could still be battery connections at battery even if they look good. Just try some electrical item that should not quit when key turned to "start" position -- hazard lights, brake lights if you can see them and if they go out while just in crank position you should find just a hairline connection enough for small items but not for starter which IS the big load.
Begin with just that simple check and then can go on to see if trigger wire isn't getting power, voltage drops etc. If that happens follow any procedures for any devices that wont like battery disconnected and clean up those terminals with a wire brush or sandpaper, neg off first back on last AYOR with setting off theft items or radio locking type things or use a memory saver,
T
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lwilli4737
New User
Oct 17, 2012, 9:35 AM
Post #3 of 8
(1949 views)
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Re: 1993 MB ignition switch no start
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thank you will try all the above suggestions.
regards
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 17, 2012, 9:57 AM
Post #4 of 8
(1939 views)
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Re: 1993 MB ignition switch no start
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It's just that age and right when cars were dumping real long last lead cable ends for junk and have had troubles with tons lots younger than this. Nothing to do with MB but they didn't like lead and mercury among other metals used anywhere they could do without,
T
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lwilli4737
New User
Nov 4, 2012, 9:21 AM
Post #5 of 8
(1834 views)
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Re: 1993 MB ignition switch no start
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So far I have found three wires with the jackets burnt off completely, 1 to the starter (#12 wire Purple/wh) 2 #14 (brown/green) 3 #14 (brown/black) of which one goes to plug in connector on pan and the other at the exhaust. do you have a drawing for these wires and also a vacuumn dwg.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 4, 2012, 10:11 AM
Post #6 of 8
(1833 views)
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Re: 1993 MB ignition switch no start
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Wiring diagrams are drawn by circuit and not by physical location. Besides, Mercedes wiring diagrams are hard to understand for even an experienced tech.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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lwilli4737
New User
Nov 5, 2012, 9:47 AM
Post #7 of 8
(1811 views)
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Re: 1993 MB ignition switch no start
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I'm in that class as a EE and can troubleshoot.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 5, 2012, 11:03 AM
Post #8 of 8
(1809 views)
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Re: 1993 MB ignition switch no start
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OK, then what circuit do you need?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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