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1999 Ford F-150 Starting Voltage Low

Tiny
TERRYDURHAM
  • MEMBER
  • 1999 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 175 MILES
When turning the ignition key to start the vehicle, the voltage to the coil of the starting solenoid on the firewall under the hood only goes to 3.5 volts dc.

The voltage is the same with the wire removed from the solenoid coil. With the key not in the starting position, the voltage is 0.6vdc

The 50amp fuse #111 is good.

I can jumper from the battery terminal on the solenoid to the coil terminal and the vehicle starts and runs fine.

Any Ideas?
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Sunday, January 10th, 2010 AT 7:03 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Are you refering to a starter mounted or one on the inner fender? Does it look like this?


http://www.2carpros.com/forum/automotive_pictures/249084_a_1.jpg



If it is like the picture, have you tried to replace it?

Let me know.

Joe
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Monday, January 11th, 2010 AT 10:33 AM
Tiny
TERRYDURHAM
  • MEMBER
  • 2 POSTS
That solenoid(relay) appears to be good. I can jumper from the 12v post to the coil and it engages the starter properly. The problem is when turning the key, the voltage to the coil terminal at the solenoid only reaches 3+ volts. Not enough to close the contacts of the solenoid.
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Monday, January 11th, 2010 AT 10:48 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Have you replaced the solenoid? Have you checked the ignition switch?
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Monday, January 11th, 2010 AT 1:24 PM
Tiny
TERRYDURHAM
  • MEMBER
  • 2 POSTS
I have not replaced the solenoid, since it appears to be working fine. Is the ignition switch mounted on steering column, under the dash?
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Monday, January 11th, 2010 AT 3:02 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Yes, it is on the steering column.
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Monday, January 11th, 2010 AT 4:08 PM

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