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Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53775
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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I have a 2013 Mercedes Benz E350 Matic. The starter fuse

Customer Question

I have a 2013 Mercedes Benz E350 Matic. The starter fuse keeps blowing? I have included a picture of the location of the fuse that keeps blowing. I think it is the starter fuse because every time I try to turn over the engine it pops? I have replaced the starter but still the fuse blows.
Submitted: 8 days ago.
Category: Mercedes
Customer: replied 8 days ago.
Picture included
Expert:  david craig replied 8 days ago.

Hi Im David, thanks for visiting the site. is this a convertible, couple or sedan?

Customer: replied 8 days ago.
Hello, its a 4 door sedan
Expert:  david craig replied 8 days ago.

thank you please standby

Expert:  david craig replied 8 days ago.

can you confirm if this is the fuse

Customer: replied 8 days ago.
Conformation is correct fuse location number 7 and a 20 amp fuse
Expert:  david craig replied 8 days ago.

ok. please standby. thank you

Expert:  david craig replied 8 days ago.

pull the starter relay. check for 12 volts on any hole on the relay plug.

Customer: replied 8 days ago.
Which one would be the starter relay?
Expert:  david craig replied 8 days ago.

standby

Expert:  david craig replied 8 days ago.

if you have an owners manual you might want to look in there while i am trying to find it.

Customer: replied 8 days ago.
I do have an owners manual but for some reason there are no diagrams for fuses or relays. They just show where the location of the fuse boxes.
Expert:  david craig replied 8 days ago.

ok. i believe this is it

Customer: replied 8 days ago.
Please stand by
Expert:  david craig replied 8 days ago.

ok

Customer: replied 8 days ago.
That relay is good
Expert:  david craig replied 8 days ago.

Im not worried about the relay being good. please check for 12 volts in one of the slots with the key off.

Customer: replied 8 days ago.
Ok Please stand by
Customer: replied 8 days ago.
Ok i think were on to something there is no voltage going to the starter relay
Expert:  david craig replied 8 days ago.

ok, not in any slot?

Expert:  david craig replied 8 days ago.

make sure you have a good fuse in the slot

Customer: replied 8 days ago.
I replaced a a new fuse in fuse location number 7 and put my tester in the realy slots and did not register anything
Expert:  david craig replied 8 days ago.

ok, now try it with the key on.

Customer: replied 8 days ago.
It is reregistering 11.20 volts
Expert:  david craig replied 8 days ago.

ok. just in 1 slot?

Customer: replied 8 days ago.
No in one slot the highest voltage reading was 2.20 and the other side was like 1.35
Expert:  david craig replied 8 days ago.

so you have no voltage anywhere with the key off. and 11.20 volts in only 1 slot with the key on? (im not worried about the smaller voltage readings)

Customer: replied 8 days ago.
Only doing 1 slot method with the key on or off it is a was low voltage in both readings
Expert:  david craig replied 8 days ago.

Im out of ideas, Im going to open this up to other techs who are more familiar with this system. good luck.

Customer: replied 8 days ago.
Ok thank you but what voltage is suppose to register?
Expert:  Marty replied 8 days ago.

Hi, different expert here. My name is***** you please post the last 8 digits of your vin number?

Customer: replied 8 days ago.
Hello Marty the last 8 are da720808
Expert:  Marty replied 8 days ago.

Thank you, ***** ***** replaced the starter relay?

Customer: replied 8 days ago.
Yw I have not because I looked at it with my muilt meter look to be good
Expert:  Marty replied 8 days ago.

The starter relay is the relay at position M in the relay box. There is a diode in the relay that may be shorted and is causing the fuse to blow. If the wrong relay is installed it will also cause the problem. The correct part number for the relay is 002 542 23 19 or 002 542 76 19. Remove the relay and see if the fuse blows when you turn the key on. If the fuse does not blow I would replace the relay. I've attached a picture of the relay location below.

Let me know what happens.

Customer: replied 8 days ago.
Ok I will do that once I get home. But what if the due does blow what is the next thing to do?
Expert:  Marty replied 8 days ago.

Let's not worry about the next step right now. I need to know the outcome of this test first. Just reply back this evening with the results.

Customer: replied 7 days ago.
HI Marty, I removed the starter relay and tried to start the car, the fuse did not pop. However I switched the relay from the Q location which has the same part number but instead of being a yellow color it is the green one switch those around and the fuse did not blow or the car did not start either?
Expert:  Marty replied 7 days ago.
Is there a part number on your starter relay?
Customer: replied 7 days ago.
A 002 542 74 19 the car was running prior
Expert:  Marty replied 7 days ago.
That's not the correct relay. Is it possible someone swapped them with another relay? Do you have a green relay in the box?
Expert:  Marty replied 7 days ago.
The green relay belongs in position M. You posted a picture early on that shows it in the wrong position.
Customer: replied 7 days ago.
I'm not sure but I swapped the and still no start? But the fuse is not blowing
Expert:  Marty replied 7 days ago.
Ok, the green relay belongs in there. Now you need to find why your starter is not working. Remove the green relay and insert a fused jumper wire from terminal 30 to 87 in the relay slots and see if the starter turns.
Customer: replied 7 days ago.
Nothing happen you think it might be short to grind
Expert:  Marty replied 7 days ago.
Can you send me a picture of your jumper installed?
Customer: replied 7 days ago.
I tried in every way possible, still nothing?Maybe you can send me where to put the jump wire because there are two 87 and 87a. That would be great if you can
Expert:  Marty replied 7 days ago.

The bottom of your relay should be numbered. Jump from terminal 3 to 5 in the box. You should be using a fused jumper lead in case you short something out. If you have no starter operation when jumping from 3 to 5 you need to recheck fuse #7. If the fuse is good and there is 12V present at slot 3 in the box it would indicate a fault with your new starter or with the wiring to the starter. I'm assuming that your battery is fully charged. I've attached a picture of the relay terminals you need to jump in the box.

Customer: replied 7 days ago.
that's what I did car did not turn over. Does the ignition have to be on?
Expert:  Marty replied 7 days ago.

Yes the key must be on in order to get power to terminal 3 in the box.

Customer: replied 7 days ago.
I tried that still no start but the good news is that fuses are not blowing anymore
Expert:  Marty replied 7 days ago.

Ok, you need to make sure that you have 12V at the jumper wire when the key is on. If you have 12V to the wire it indicates a fault with the new starter or the connections to the starter. Place the wire in terminal 3 and measure the voltage then place it in terminal 5 and measure the voltage. One of the two slots should have 12V with the key on.

Customer: replied 6 days ago.
Ok I got 10.5 volts from 30 slot when I turned the key over
Customer: replied 6 days ago.
I think battery needs to be charge the batt is also 10.5v
Expert:  Marty replied 6 days ago.
you definitely need to charge the battery.
Customer: replied 6 days ago.
I have a jump box on it what should I look for next?
Expert:  Marty replied 6 days ago.
Do you have 12V at the battery and the relay terminal with the jump box connected?
Customer: replied 6 days ago.
that is correct
Expert:  Marty replied 6 days ago.
still no starter operation when you jump the two terminals? If that is the case you need to check the voltage at the starter with the fused jumper installed. You should be getting 12V to the small wire on the starter.
Customer: replied 6 days ago.
Ok I'm going to remove that starter and measure the voltage. Is there an ez way removing this starter took me forever the first time
Expert:  Marty replied 6 days ago.

I would just connect to the small wire at the starter with a test lead in order to measure the voltage. I would not remove the starter just yet. Click on the image below. Connect your test light or positive voltmeter lead to terminal #3 in the picture then install your jumper lead in the relay box and see if you have 12V at the starter. If you do then I would say your new starter is defective.

Customer: replied 6 days ago.
The image is just for an example? Because my starter is located on the drive side?
Expert:  Marty replied 6 days ago.

Yes, it is probably relocated on the 4matic models.