No crank after stalling out

Tiny
BIGDADDYFRIED
  • MEMBER
  • 2013 FORD FOCUS
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 72,000 MILES
Checked battery, starter relay and starter all are fine. Found F38 was blown. Replaced fuse and it blew again, Replaced with 30 amp fuse was all I had and it started then stalled and fuse was blown again. Looking for wiring diagram to the F38 fuse circuit.
Thursday, January 9th, 2020 AT 7:03 AM

11 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
There's also a fuse 38 in the Rear Junction Box, but that one is listed as "not used".

A simple trick to finding a short is to replace the blown fuse with a pair of spade terminals (for spade-type fuses), then use small jumper wires to connect them to a 12 volt light bulb. A brake light bulb works well. When the circuit is live and the short is present, the bulb will be full brightness and hot so be sure it's not laying on the carpet or against a plastic door panel. Now you can unplug electrical connectors and move things around to see what makes the short go away. When it does, the bulb will get dim or go out.

To add to the misery, you'll see at the top of the first diagram, 12 volts comes from the Ignition Relay. On some car models that relay only turns on for one second, then again when the engine is cranking or running. It is not practical to have a helper cranking the engine while you do the testing, and one second is obviously not enough time. If you find the 12 volts goes away shortly after you turn on the ignition switch, you can bypass the ignition relay instead with the light bulb, but you'll have to install a good fuse 38.

Insert the two spade terminals into the ignition relay's socket, terminals 3 and 5 as pointed out with the blue arrows in the fifth drawing. With this method, the ignition switch doesn't even have to be turned on. The rest of the procedure is the same, and it will save you from blowing dozens of fuses.
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Thursday, January 9th, 2020 AT 2:06 PM
Tiny
BMDOUBLE
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What I have seen time and time again is the white with blue wire on the diagram that I've provided will get chafed against the transmission pan edge and pop that fuse! I would look there first!
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Thursday, January 9th, 2020 AT 2:09 PM
Tiny
CARADIODOC
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Thanks BMDOUBLE. Is that the one on top going to the floor shifter?
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Thursday, January 9th, 2020 AT 3:47 PM
Tiny
BIGDADDYFRIED
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Definitely going to start with the short bulb search. Tried swapping out the TCM last night with the same results. Will start on a 30 amp fuse then stall with a puff of electrical smoke from around the valve cover area assuming the ignition coils overheating.
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Friday, January 10th, 2020 AT 5:36 AM
Tiny
BIGDADDYFRIED
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May need to find where that elusive blue/white wire originates as it is not readily visible from top or bottom of the engine compartment but it was late and dark.
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Friday, January 10th, 2020 AT 5:37 AM
Tiny
CARADIODOC
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Ford has had a lot of trouble with their ignition coils, but not by shorting out internally. They usually fail to develop enough spark voltage. For that reason, I'm inclined to lean toward the white / blue wire BMDOUBLE mentioned, then a shorted coil as the lesser suspect. That smoke you saw could be caused by that wire arcing, then it drifted up to the valve cover area.

If you use the light bulb in place of the relay, you'll see the bulb flash bright an dim when you wiggle the wiring harness along the transmission pan. If that doesn't do it, and the bulb is bright, unplug each ignition coil and see if the light dims.
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Friday, January 10th, 2020 AT 11:24 AM
Tiny
BMDOUBLE
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Caradiodoc-yes, Follow the white-blue wire (yellow brick road) especially near the transmission pan.
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Friday, January 10th, 2020 AT 12:50 PM
Tiny
BIGDADDYFRIED
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Success! Hooked up the bulb in the fuse box to the ignition relay R16 and it was bright as could be until I unplugged ignition coil #1. Left it unplugged and she started right up! Replaced the ignition coil and she's be running like a champ ever since. Thanks for that trick!
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Monday, January 13th, 2020 AT 5:29 AM
Tiny
CARADIODOC
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All right. One in a row! Happy to hear you solved it.

You didn't say if the test bulb was still in place when the engine started. A brake light bulb only allows one amp of current to flow, and that may not be enough to run the circuit properly. When that happens, use a head lamp bulb instead. A low-beam filament allows up to five amps to flow. That is usually enough to keep an ignition system or an injector circuit working, while still offering circuit protection if an intermittent short shows up.
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Monday, January 13th, 2020 AT 1:14 PM
Tiny
BMDOUBLE
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Awesome!
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Monday, January 13th, 2020 AT 3:28 PM
Tiny
BIGDADDYFRIED
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Definitely took the bulb out and replaced the relay to start it. Popped 6 codes starting on 3 cylinders but cleared them with the scan tool after replacing the ignition coil and checking for more problems. Thanks again.
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Tuesday, January 14th, 2020 AT 6:56 AM

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