Electrical problem
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Cross-Country
Joined: Mar 2020
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Electrical problem
Hopefully someone has encountered this, but all my hazard signals work, but only the rear turn signals work. All new bulbs. Is there a seperate circuit that runs turn signals and hazards?
Senior User
Joined: Dec 2019
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but if the switch was bad would the rear blink and not the front? I’ve heard of symptoms like this attributed to a bad ground somewhere.
Fleet Mechanic
Joined: Jul 2017
Posts: 1,276
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From: KY
So all 4 lights front an back flash with hazards ? But only rear flash with turn signals ? If thats the case I would lean towards corrosion up front at sockets an housings ,,weak grounds or something like that,,If the hazards work front an back but no turn signals at all then there are two flashers under dash , one for hazards one for turn signals , and the one for turn signals may be bad
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
So all 4 lights front an back flash with hazards ? But only rear flash with turn signals ? If thats the case I would lean towards corrosion up front at sockets an housings ,,weak grounds or something like that,,If the hazards work front an back but no turn signals at all then there are two flashers under dash , one for hazards one for turn signals , and the one for turn signals may be bad
1974 F100/350 from serial number T80,001, 1975/79 F100/350 park and Styleside tail lamp lens/body is a one piece assembly, the plastic sockets twist into the housings.
The tail lamps and sockets are also the same as 1975/91 Econoline and 1978/79 Bronco.
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Cross-Country
Joined: Mar 2020
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I replaced one of the sockets up front because of the ground tab was corroded away. A may replace the other as well. If that doesnt work, I'll try to find their ground and clean it or replace the connection.
Mountain Pass
Joined: Aug 2018
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Start by cleaning all the grounds, battery post to engine, intake to firewall, with these trucks being so old, I did the same, and have seen great results. The grounds, I do believe for the front circuit are on the rad support, hidden under little pieces of material to hide them I guess... clean them up real good, and see if you can get some place. 
Good luck
Good luck
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