1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

302 5.0

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Old

May 6, 2017 | 06:07 AM

#1

Zacbkennedy

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Mountain Pass

Joined: Oct 2016

Posts: 172

Likes: 1

From: georgia

302 5.0

Hey everyone my truck has been running great hot or cold. But on the way to work this morning around 4:45 am I had to use my headlights. I do majority day driving. Anyways, when the motor is cold and I turn the headlights on the idle becomes rough high low high low high low lights dim and brighten but once the motor is warm the headlights no longer affect the idle. Any ideas? It is a new battery and a new alternator.

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Old

May 6, 2017 | 07:04 AM

#2

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,786

Likes: 1,751

From: Kentucky

Is this truck the one in your signature?

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Old

May 6, 2017 | 08:14 AM

#3

Zacbkennedy

Thread Starter

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Mountain Pass

Joined: Oct 2016

Posts: 172

Likes: 1

From: georgia

It is, when I've had problems with the motor this particular form has been a lot of help

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Old

May 7, 2017 | 11:29 PM

#4

TeeRob

Junior User

Joined: Sep 2016

Posts: 62

Likes: 7

From: Michigan

Could have got a lemon alternator, that would be the first thing I check.

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Old

May 8, 2017 | 07:54 AM

#5

jas88

Lead Driver

Joined: Feb 2002

Posts: 7,958

Likes: 592

From: Greater Austin, Texas

Club FTE Silver Member

Is alternator connector melted?

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Old

May 8, 2017 | 10:11 AM

#6

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,786

Likes: 1,751

From: Kentucky

Where did you ground the computer (PCM/ECM)? Since the issue is pretty much temperature related I suspect a loose ground somewhere.

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