Electrical issue

Reply Subscribe

Thread Tools

Search this Thread

Jan 18, 2016 | 05:40 AM

Spartacus1

Thread Starter

New User

Joined: Dec 2015

Posts: 17

Likes: 0

Electrical issue

Can someone help me to find out why All my lites are out.? My 48 f1 6cyl 6volt pos ground last week blew a headline fuse.I replaced it,worked fine all week,now no headlites,tailites,brakelites ,gauges work,no lites on dash ,horn works, truck starts and runs.Checked fuses all are good,any help would be appreciated

Jan 18, 2016 | 06:10 AM

newold46

Fleet Mechanic

Joined: Sep 2010

Posts: 1,587

Likes: 36

From: South Carolina

Headlight and/or the dimmer switch.

Jan 18, 2016 | 01:57 PM

Jolly Roger Joe

Lead Driver

Joined: Jul 2011

Posts: 6,599

Likes: 34

From: Rockingham, VA

Quote:

Originally Posted by Spartacus1

Which aftermarket harness do you have? There are no fuses in a stock harness, but there are two circuit breakers. One of those controls power to the light switch/headlights/tail lights. The other controls the brake lights.

Does your truck still have those circuit breakers under the dash?

Jan 18, 2016 | 05:26 PM

76-5.0

Senior User

Joined: Dec 2015

Posts: 183

Likes: 0

From: Northeast Oklahoma

Get a test light and check for power.

Jan 18, 2016 | 08:04 PM

FortyNiner

Logistics Pro

Joined: Jun 2011

Posts: 4,995

Likes: 422

From: u-rah-rah Wisconsin

What's a headline fuse? As 76-5.0 indicated, start by checking your power connections.

Jan 18, 2016 | 09:10 PM

underthebridgejim

FTE fan

Joined: Dec 2006

Posts: 3,674

Likes: 11

From: paradise, northern calif.

You mentioned that you replaced a blown fuse and it fixed your lights for a week, Is that same fuse blown again? If so it may be a place to start. It could be as simple as water in the tail lite , shorting out the circuit or something that requires much more researching. Im not familiar with the pos ground system, but here is a schematic that may be of some help. Ther are several schematics this is the only one I have at the moment but if you need another one (out of the shop manual) Im sure someone will be glad to post it for you. Im just very pressed for time, IM cooking dinner , I hope this helps along with what has already been posted.

Attached Images

Jan 18, 2016 | 11:35 PM

underthebridgejim

FTE fan

Joined: Dec 2006

Posts: 3,674

Likes: 11

From: paradise, northern calif.

I found this other Schematic on the internet, best of luck.

Attached Images

Top 10 Fords at 2026 Carlisle Ford Nationals

Joe Kucinski

3 Best / 3 Worst Parts of Modern Ford Ownership

Brett Foote

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

Pouria Savadkouei

Every 2026 Ford Engine Explained

Brett Foote

10 Ugly Ford Trucks That We Still Kinda Love

Joe Kucinski

10 Things Every Truck Owner NEEDS (2026 Edition)

Michael S. Palmer

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Verdad Gallardo

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Joe Kucinski

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Brett Foote

Top 10 Ford Truck Tragedies

Joe Kucinski

Jan 23, 2016 | 02:28 PM

petemcl

Logistics Pro

Joined: Nov 2011

Posts: 4,685

Likes: 81

From: Northville, MI

I think that we need a bit more information and pictures. Also what is your skill level? Do you know how to trace electrical shorts with an ohm meter?