1997 F350 headlight switch problem - Ford Powerstroke Diesel Forum
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  #1  
Old 01-06-2013, 03:47 PM
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1997 F350 headlight switch problem

Got this truck and when you pull out the headlight switch all the way the headlights come on, but there is no dash lights or taillights. If you fuss with switch it all works like it should. But to find that sweet spot it is a pain and if you hit a bump it goes out. Put a new one in today and it does the same thing. Put one in from my F150 and it does the same thing. Both work fine in the F150. So what could it be? Thanks guys.

Here's a pic

1997 F350 headlight switch problem-imageuploadedbyag-free1357519649.996414.jpg


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Old 01-07-2013, 05:13 AM
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Anyone have an idea?
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Old 01-07-2013, 10:20 AM
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It's not the switch. That's just coincidence when it works in between positions; it's the headlight power feed feeding the parking light circuit (i.e. "sneak"). Did you check the parking light fuse?
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Old 01-07-2013, 02:23 PM
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I looked over a few fuses, but don't think I did that. You can hear a resistor click when it does work all the lights. I went to Ford today and they said they have never heard of it. Lemme go check parking light fuse. Is it under dash or hood?
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Old 01-07-2013, 02:31 PM
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Fixed. Thanks!


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Old 01-07-2013, 02:42 PM
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And it was.....
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Old 01-07-2013, 03:22 PM
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The fuse you said. Position 4. I looked yesterday at position 10 cause it said instrument lights. But position 4 also says instrument lights, but I missed that yesterday.


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Old 01-08-2013, 06:43 AM
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Yeah, I think 4 is for the whole parking light circuit, including the dash lights, and 10 is for just the dash lights, after it splits off and goes to the dimmer. So when the parking lights go too, it's the upstream fuse.
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Old 07-08-2014, 11:47 AM
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Angry # 4 Fuse keeps blowing on Old Body Style direct effect on torque converter

The number 4 fuse continues to blow. After researching, this is the common "Ford Brown Wire" issue. Inside the headlight switch is a connector block. The brown/white wire is notorious for shorting out. This in turn knocks out the marker lights, and tail lights. This was the case with 91 Ford F-150 and 97 F-250 Super Duty. Clip all the wires, I bought both new switch and wired plug, connected and all was good.

A third brake light on the back top of cab being burnt out can cause your transmission to shift out of overdrive. From 94 to 97 for some stupid reason, Ford decided to attach the brake lights to the transmission. When the 3rd brake light burns out or burns up the plug (normally this will be the problem) the computer gets a "open circuit signal" and send a signal to the computer to down shift. If you are driving up a hill, you transmission can shift into overdrive. When you start down the hill, your tranny will shift down out of overdrive into D3. Just the opposite of normal. I had this issue for 3 years with my truck. Replaced the 3 brake light plug and bulb and the tranny worked perfect.

It appears that if you have # 4 fuse issues. Change the switch, plug, and then check all your marker light and tail light "PLUGS". Make sure they are not shorted out and fused creating a dead ground that will continue to blow the #4 fuse. If I could have found a posting 3 years ago, I would have saved many headaches and about $2,000.00 in Ford shop rip-off. I truly hope this helps someone. If you have any questions feel free to contact me.
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Old 07-26-2014, 11:13 PM
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I just dealt with that problem not 2 weeks ago. After much head scratching I realized my tail lights were out and I replaced them and all was well
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