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Wont turnover 1998 e320. Jump start, reset check battery. No…

Customer Question
Wont turnover 1998 e320 ...

Wont turnover 1998 e320

Mechanic's Assistant: Are you fixing your E320 yourself? What have you tried so far?

Jump start, reset check battery

Mechanic's Assistant: Does the battery look like it's leaking? And does it have a strong smell -- like sulfur?

No 12.5v

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Key turns not cranking

Submitted: 8 months ago.Category: Mercedes
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Customer reply replied 8 months ago
are you there
Answered in 6 minutes by:
9/28/2017
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 6,016
Experience: 20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.
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Hello, my name is***** and i will do my best to assist you.I am going over your story now and will reply back soon with some info,thanks!

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

most times the issue is a failed starter or failed starter relay which is internal to the small fuse and relay module that is located in the passenger side of the engine bay under the big black cover.

you need to see if there is power on the purple wire at the starter when cranking the key, if there is the starter is bad, if there is not then the relay module needs checked and or replaced.

hope this helps

Please take a second and click the stars at the top of the screen to rate my service so I may be paid for my assistance.5 stars is ideal :) . Please save me as a favorite and request me in the future.Keep in mind that when you rate it does not end our conversation, all it does is pay me for my help. You can still return here to me for follow up information if needed just simply reply back, thanks!
Lou P.
Master Mercedes-Benz Technician
Master ASE Certified

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Customer reply replied 8 months ago
what about ignition switch
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

only if you find there is no signal to the starter and no signal to the relay module would we suspect an ignition switch.

based on the issue the most common fault is

  1. starter
  2. relay module
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Customer reply replied 8 months ago
how do you suggest I check if I am getting power at purple wire
Customer reply replied 8 months ago
regular test light
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

with a normal test light.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

you can check the purple wire at the module box BUT you can also have a poor connection or rusted or burned connection at the starter so that is why I say test there.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

I can do the phone call but wont be able to call until later today if that is ok?

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Customer reply replied 8 months ago
ok have power with key off.....no power with key in start position on purple wire.......how do I check relay
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

check the two purple wires on the relay module. one is the starter crank circuit in from the eis the other is the output to the starter

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Customer reply replied 8 months ago
tested the purple wire again....this time power all the time doesnt matter if I try to start car
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

that does not make sense,. are you using a meter or test light?

and is your test light a single wire or dual

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Customer reply replied 8 months ago
using a 12 volt test light and it is single wire
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

ok and you have the clip clipped to ground?

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

as a test use a wire and apply power to the purple wire that goes to the starter.

see if the starter cranks.

make sure the connections at the relay box are unplugged to not damage anything.

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Customer reply replied 8 months ago
my mistake I didnt have it well grounded....I dont have power to the purple with the key off or on
Customer reply replied 8 months ago
not sure how you want me to apply power to the purple wire that goews to the starter at the box where I am testing? if so how do I apply power to it.....and do I just pull the relay out
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

use a wire and connect it from a positive source to the purple wire.

if you are not knowledgeable with this kind of work it might be best to take it to a shop.

I dont want something to get damaged if you have not done this kind of stuff before.

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Customer reply replied 8 months ago
got it to crank and turn over
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

by applying power?

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Customer reply replied 8 months ago
starter cranked
Customer reply replied 8 months ago
just took wire from positive plugged into purple engine cranked
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

ok, do you have a second key to try in the ignition?

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Customer reply replied 8 months ago
have two keys
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

ok did you try them both?

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

ok, not looking good for the eis.

ok so how many purple wires do you have on the fuse box, should be 2?

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Customer reply replied 8 months ago
no just one
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

ok give me a second

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

can you give me a build date on the drivers door sticker

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Customer reply replied 8 months ago
ok 5/98
Customer reply replied 8 months ago
hello
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

yes??

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Customer reply replied 8 months ago
what now?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

lol, well you have to give me a second to look over the diagram and type a response.

so on the same fuse/relay module do you see a wire that is red with blue and white circles on it?

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

that wire should have ground when cranking the engine.

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Customer reply replied 8 months ago
ok so what do i do
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

hook the clip of the test light to a positive source and check that wire with the tip when cranking, see if it lights the light

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Customer reply replied 8 months ago
have power dim but its lit
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

then no you do not, the engine module is not allowing cranking,

does the dash display the proper gear? P for park?

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Customer reply replied 8 months ago
its not lit on console
Customer reply replied 8 months ago
the engine will crank just fine
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 8 months ago

ok then you need the car diagnosed to see if its a shifter problem or interior communication problem, there is nothing more we can test without a mercedes scan tool.

Please take a second and click the stars at the top of the screen to rate my service so I may be paid for my assistance.5 stars is ideal :) . Please save me as a favorite and request me in the future.Keep in mind that when you rate it does not end our conversation, all it does is pay me for my help. You can still return here to me for follow up information if needed just simply reply back, thanks!
Lou P.
Master Mercedes-Benz Technician
Master ASE Certified

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