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Discussion Starter · #1 ·
I have Recently Removed my engine In my 2000 Mustang to do frame repair
and after putting it back in it fired up right away. I realized it was running a
little rough so I decided to get a new spark plug but now no power is getting
to the starter relay. I know That changing the plugs has nothing to do with it
but it just stopped working. I have tried many things. All of the dash lights
turn on in the run position but when I go to start the car no sound from the
starter at all. I ended up getting a new starter, Alternator, A new ignition
control switch, Key tumbler and checked and bypassed the clutch safety
switch just in case that was the problem. Still Nothing. I did find out that I
could start the car by jumping the #30 and #87 pins on the starter relay to
get it running. the relay is fine but after some testing, no signal is sent to the
relay to send power to the starter. I do have anti-theft but the light is not on
and the anti-theft turns off when I have the key in the ignition. I am running
out of options. I am just asking for any possible ideas on what to check.
Thanks.
 

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Welcome to the Forum
I was searching on your issue and couldn't find exactly your issue
On a 2002 Mustang they have a connector under the battery box that gets corroded and loses contact
you may check that out
 

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Phoenix, AZ 85008
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Welcome to the FFO!

What engine did the Mustang come with?

Attached is a wiring diagram. Not the best one I have ever seen.
Does the starter relay look like the second pic?

Is there power to one side of the clutch safety switch?

Action
Rectangle Font Slope Parallel Diagram
Product Liquid Bottle Fluid Electronic instrument
 

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Discussion Starter · #4 ·
Welcome to the FFO!

What engine did the Mustang come with?

Attached is a wiring diagram. Not the best one I have ever seen.
Does the starter relay look like the second pic?

Is there power to one side of the clutch safety switch?

Action View attachment 48714 View attachment 48715
The engine is a 3.8L V6 and Using a multimeter power is getting to one side of the clutch safety switch.

The relay look like this
48719
 

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Phoenix, AZ 85008
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If power is not coming out of the relay either ...
The relay is bad
OR the control circuit for the relay is not working. That control circuit is powered by the ignition switch.

Power to the starter comes through the relay with a yellow wire to #30 pin
Goes through the relay from the #87 pin in a white/pink wire.
Since you jumped that and the starter cranked up, it is the control circuit issue

There is another white/pink wire to #85. With ignition key to crank, there should be battery voltage there.
IS THERE 12 volts then?

The other side is black to the #86. This is the ground to the control circuit.
Is there a good ground at the black wire?

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Rectangle Font Parallel Slope Pattern
 

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Discussion Starter · #8 ·
If power is not coming out of the relay either ...
The relay is bad
OR the control circuit for the relay is not working. That control circuit is powered by the ignition switch.

Power to the starter comes through the relay with a yellow wire to #30 pin
Goes through the relay from the #87 pin in a white/pink wire.
Since you jumped that and the starter cranked up, it is the control circuit issue

There is another white/pink wire to #85. With ignition key to crank, there should be battery voltage there.
IS THERE 12 volts then?

The other side is black to the #86. This is the ground to the control circuit.
Is there a good ground at the black wire?

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Using a multimeter we are only getting power out of the #30 Pin and that is how we are jumping it. While I am cranking I am getting no reading out of the #35 Pin Is there a way to bypass the anti-theft module to test if it is bad or is it built into the ECU?
 

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Hmmm you stated you jumped #30 and 87 and the starter cranked!

OK no power at #30. Yellow wire which should be hot all of the time. (Not the best diagram like the EVTM which labels connectors)
Test for power at 40amp fuse under hood. Yellow wire coming out of the under hood fuse box.
And test the fuse as well

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Discussion Starter · #10 ·
Hmmm you stated you jumped #30 and 87 and the starter cranked!

OK no power at #30. Yellow wire which should be hot all of the time. (Not the best diagram like the EVTM which labels connectors)
Test for power at 40amp fuse under hood. Yellow wire coming out of the under hood fuse box.
And test the fuse as well

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All Fuses have been checked and replaced. The car runs Great after Jumping the pins, It's not like anything is telling the car not to run it just will not send a signal to the relay. I will test if power is getting to the fuse.
 
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