2003 Ford Taurus Starter Circuit

EMRDAVID

MEMBER
2003 FORD TAURUS

Electrical problem
2003 Ford Taurus 6 cyl Two Wheel Drive Automatic

I'm having problem engaging the starter. The problem is intermittent as it usually starts when it cools down and has happened 3-4 times over 4 month.

I suspect a stuck solenoid plunger. Since I don't have a schematic:
1. Could there be anything else?
2. Can you supply me with a schematic?

Thanks in advance

5 Replies

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

Hello
Thanks for the donation

It does seem to be a faulty solenoid, however an intermittent problem is just that..intermittent. This makes it very difficult to diagnose the culprit because you can test the component one time and it will be good but you may test it again and it will be showing faulty..Below is the circuitry for your vehicle's starting system..hope this helps..

Let me know if you need further assistance..

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Monday, April 20th, 2009 AT 2:01 PM

EMRDAVID

MEMBER
3 POSTS

Thank you for a prompt response.

Based on the circuit diagram we have transmission switch, starter relay and starter.

It seems that I hear a click so transmission switch sends current to the relay. Is relay malfunctioning?

Unfortunately I can't remotely activate the starter solenoid it's raining and I hardly have any tools (remote switch).

Am I missing something?

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Monday, April 20th, 2009 AT 2:15 PM

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

I was going to suggest switching the starter relay with a diff relay same size but I forget to put that in my original post. If you hear clicking then that is either the solenoid or the relay..you can learn how to test a relay at the following link..

https://www.2carpros.com/how_to/how_do_i_check_a_relay.htm

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Monday, April 20th, 2009 AT 2:18 PM

EMRDAVID

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3 POSTS

LOL. I know how to troubleshoot a relay if I know the pinout. Do you have one.
Thank a bunch.

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Monday, April 20th, 2009 AT 2:58 PM

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

Haha sorry about that..we never know how much knowledge a poster has :)

Ok you need to measure voltage between the No. 86 terminal and ground. Do this with tranny in Park or Neutral and switch in START position. Let me know if battery voltage is present or not present.