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My lincoln 1999 town car keeps blowing fuse 12 in the fuse

Customer Question
box in the car JA: Have...
my lincoln 1999 town car keeps blowing fuse 12 in the fuse box in the car
JA: Have you had any recent electrical work done on the car? Have you checked the circuit?
Customer: no electrical work done it started this morning then it blew the fuse which kills the cluster instrument and fuel pump
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: i put a new ignition switch in and its still blows fuse 12
JA: Anything else you think the mechanic should know?
Customer: no
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Lincoln Mechanic about your situation and then connect you two.
Submitted: 1 year ago.Category: Lincoln
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Answered in 3 minutes by:
6/18/2016
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago
Ronnie
Ronnie, ASE Certified Technician
Category: Lincoln
Satisfied Customers: 36,349
Experience: 35 years as an automotive tech
Verified

Hello and thank you fro your question,

If 30 amp fuse 12 for the air suspension compressor in the power distribution box repeatedly blows due to a dead short, the problem is most likely a defective air suspension compressor. To verify the short is not in the harness, unplug the air suspension compressor connector, remove the compressor relay from the power distribution box and install a jumper wire between terminals 30 and 87 in the relay box. If the fuse does not blow, the harness is OK. In most cases, the problem is due to excessive moisture in the compressor causing it to corrode. This is usually caused by leaking rear air bags allowing moisture to enter the system. To repair, if the compressor can be disassembled, cleaned it out and lubed it. In cases where it can not be disassembled, the compressor will need to be replaced. In either case, a new dryer assembly will need to be installed and any system leaks must be repaired to prevent a repeat failure.

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Customer reply replied 1 year ago
its a 15 amp fuse not 30 left of the stering column inside the car
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

Does the engine start and run?

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Customer reply replied 1 year ago
blowing (#12) which is a instrument cluster, anti theft, ignition switch, and ignition coil fuse.
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

Yes I know that, dose the engine start and run?

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Customer reply replied 1 year ago
it turns over but does not start because 12 shuts of the fuel pump
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

Actually it shuts off power to the coils. I would start with taking a close look at the engine harness to each coil looking for a short to ground and if that checks okay then try unplugging one coil at a time and see if the fuse holds. See the circuit wiring diagram in the link below for reference. Copy and paste the link to your browser to open and view it.

https://dl.dropboxusercontent.com/u/104923897/Fuse%20%2312%20Jun%2018.pdf

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Customer reply replied 1 year ago
unplugging one coil at a time and see if the fuse holds ? how do i do that umpludg a coil turn the ignition and see if it blows the fuse?
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

Your engine has coil on spark plug which means you have 8 coils, one on each spark plug. You can unplug one at a time and it will still run, before you do that take a close look at the engine harness to each one of them.

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Customer reply replied 1 year ago
You can unplug one at a time and it will still run. ? it does not run the fuse blows so how can it run?
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

If its a failing coil unplugging one at a time will tell you which one is shorted simply by turning on the key, You do not have to start it.

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Customer reply replied 1 year ago
just go through each coil unplug it turn the key to see if the fuse blows? on each coil?
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

Yes but before you do that take a close look at the engine harness to each coil for any signs of a short to ground. If you do not see any issue with it , then do one coil at a time.

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Customer reply replied 1 year ago
ok ill go try that i have a lot of fuses so ill try each coil 1 at a time what happens next do i disconect with you or keep it open this chat?
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

The post remains open as long as you need me. Be sure to check the harness First.

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Customer reply replied 1 year ago
ok the first coil i took of was coil for cylinder 1 left side of engine nearest the firewall i disconected it and turned the key and the fuse did not blow..
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

Okay then start the engine with is disconnected and see if it will start and run . If so and the fuse hold then either the harness to it is shorted or the coil is.

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Customer reply replied 1 year ago
the car is running now should i go to the dealership and buy a coil or should i swap a coil and see if it works
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

I would try swapping the #1 coil with the #2 coil and see if the fuse blows again and if it does then the coil is bad and needs to be replaced.

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Customer reply replied 1 year ago
ok it was running with the coil disconnected then it just stopped i checked the fuse and it was blown while it was ticking over
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

Okay then that sure point to a bad coil.

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Customer reply replied 1 year ago
how do i find out which coil it is then
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

Did you not say it started with #1 unplugged and ran?

Did you ever look at the harness to all of the coils?

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Customer reply replied 1 year ago
i did and i just replaced the 15 amp fuse in no 12 and it started up again with the coil no1 still of ..no inever checked the harness yes. what do i look for on the harness?
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

Your looking at the harnesses to each coil for any signs of where it may have rubbed through and touching ground. If it stay running with the #1 coil unplugged the the problem is with the coil or the harness to it.

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Customer reply replied 1 year ago
ok got ..now it just stopped again with out number 1 coil on i checked the fuse it was blown, now i connected the coil back together put in a new fuse and it blew again right away..
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

Then I would be looking very close at the harness to that coil.

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Customer reply replied 1 year ago
ok let me go look no cracks no ground as far as i can see i took of the same coil new fuse started straight up lets see if its still running in ten mins and then if it is should i go get a coil ? and do you think that could fix everything?
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

If the coil is shorted then yes it should . Im not convinced just yet it is. Chasing a short to ground can be a real SOB as you are finding out. Lets see what happens .

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Customer reply replied 1 year ago
ok its still running its been 10 mins..
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

Just for the hell of it while its running go back out and pull on the engine harness in and around the other coils and see if its stays running.

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Customer reply replied 1 year ago
it went of and i tried to start it up again with the new fuse and the no1 coil still didconnected and the fuse blew
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

Okay then you are still dealing with a short in the circuit.

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Customer reply replied 1 year ago
were can it be then?
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

I suspect its in the circuit you working on but I can not say for sure.

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Customer reply replied 1 year ago
what would you suggest?
Customer reply replied 1 year ago
how can i bypass the fuse no 12 wire it somehow?
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

You do not want to by pass the fuse, its blowing for a reason, you have to have a short to ground and if you by pass it you could smoke the harness. You need to locate the short.

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Customer reply replied 1 year ago
i know that but were do i start back at the coils?
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

Back at the coil and the engine harness. Something is being over looked here.

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Customer reply replied 1 year ago
i put coil1 back on took of coil 3 and it started up is this strange ?
Customer reply replied 1 year ago
now its running so its not shorting out correct? now if it runs for awhile then blows the fuse hmmm its something when the engine gets warm? going to keep it running and if it does not stop well its coil number 4 then not 3 ..right now its running with out coil number 4 i grabbed the harness moved it around nothing has stopped yey..
Customer reply replied 1 year ago
the airbag light is flashing do you think that has something to do with it?
Lincoln Mechanic: Ronnie, ASE Certified Technician replied 1 year ago

The air bag flashing means the system is seeing a fault and should be setting a fault code for this and its not likely related to the blow fuse. Im off today but will return on Monday if you do not get this resolved before then

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Ronnie
Ronnie, ASE Certified Technician
Category: Lincoln
Satisfied Customers: 36,349
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Experience: 35 years as an automotive tech

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