messed up lighting
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messed up lighting
'78 Ford F150. Can't figure out what's going on with my lights or where to start.
1. With headlights on, the right front/back lights both filaments of the bulb are on, but on the left side, just one filament is on.
2. Blinkers: right rear works, but not r-front. Left front works, but not rear
I've swapped bulbs and replaced fuses but no nothings changed.
A bad wire or short somewhere? Where do I start?
john
1. With headlights on, the right front/back lights both filaments of the bulb are on, but on the left side, just one filament is on.
2. Blinkers: right rear works, but not r-front. Left front works, but not rear
I've swapped bulbs and replaced fuses but no nothings changed.
A bad wire or short somewhere? Where do I start?
john
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Step 1. Get a Voltmeter.
Step 2. Learn how to use said Voltmeter.
Step 3. Review wiring diagram for 78-150. Link available here in the Electrical section: https://www.ford-trucks.com/forums/1...l#post13139591
Step 4. Test circuits for shorts, opens, grounds, and voltage.
Welcome to FTE.
Step 2. Learn how to use said Voltmeter.
Step 3. Review wiring diagram for 78-150. Link available here in the Electrical section: https://www.ford-trucks.com/forums/1...l#post13139591
Step 4. Test circuits for shorts, opens, grounds, and voltage.
Welcome to FTE.
Fleet Mechanic
Joined: Feb 2010
Posts: 1,742
Likes: 5
From: Near St. Joseph,MO
90% of electrical problems with these trucks are bad grounds or corroded contacts. 9% is turn signal switch and the other 1% is random. 
99% of percentage numbers are made up on the spot, but I'll bet I'm close.
99% of percentage numbers are made up on the spot, but I'll bet I'm close.
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