How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Chris (aka- Moose) Your Own Question
Chris (aka- Moose)
Chris (aka- Moose), Mercury Technician
Category: Mercury
Satisfied Customers: 47633
Experience:  16 years experience with Mercury
Type Your Mercury Question Here...
Chris (aka- Moose) is online now
A new question is answered every 9 seconds

Blows engine module fuse as soon as turn switch on

Customer Question

blows engine module fuse as soon as turn switch on
Submitted: 1 year ago.
Category: Mercury
Expert:  Chris (aka- Moose) replied 1 year ago.

Welcome, I'm Chris (aka Moose).

Do you know the fuse number and amp?

Are you able to do some electrical testing?

Customer: replied 1 year ago.
30 amp
Expert:  Chris (aka- Moose) replied 1 year ago.

None of the 30 amp fuses are for engine controls. Can you look at this diagram and tell me which fuse is failing?

Customer: replied 1 year ago.
It is the 60 amp fuse. The kind were u can l look at top and tell if good or not. The fuse is yellow
Customer: replied 1 year ago.
Do u know which fuse I am talking about
Expert:  Chris (aka- Moose) replied 1 year ago.

Previously it was a 30 amp fuse failing, now it is a 60 amp fuse. You say its a a engine module fuse. There are 2 60 amp fuses #2 engine cooling fan and #3 ABS and Blower. With one of those is failing?

You can use the diagram I sent and tell me the fuse number which would help alot better.

Customer: replied 1 year ago.
The fuse was 20 amp and it said it for engine module
Expert:  Chris (aka- Moose) replied 1 year ago.

Is it fuse 9

Please look at the file I sent and verify prior to me diagnosing this?

Customer: replied 1 year ago.
The fuse position number 9 . It is a 20 amp
Customer: replied 1 year ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Chris (aka- Moose) replied 1 year ago.

Thanks, ***** ***** be easier to say what this circuit does not power. There are alot of things and wires to possibly blame.

  1. Remove fuse 13 under the hood.
  2. Unplug everything on this page.
  3. Unplug everything on this page
  4. Try another PCM fuse.

If the fuse does not fail with the key on then start plugging in things one by one till the fuse fails, meaning that component is faulty. If the fuse fails with everything unplugged then there is a wire shorted to ground SOME WHERE. A more common short is the wiring to the O2 sensors, which your disabling in step one with fuse 13 removed.

Please make sure to select a rating from the top of your screen prior to logging off so the post does not time out.

Thanks Moose.

Expert:  Chris (aka- Moose) replied 1 year ago.

Hello again Chris here,

I am contacting you because the post has not been closed or rated. We have 7 days to get a post rated before it times out. When a post times out, that means its no longer on my active list (if you reply I never know it.) You have already paid the fees to get this question answered, but it appears your not pleased, or need more help.

Let me help some more. Is there anything else you feel I could offer so you would be pleased with my help. I have the option to call you if that would be better.

Thanks Chris