1970 ford f100 headlight problem
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1970 ford f100 headlight problem
Having a weird electrical issue with my 70 f100. The issue is when my headlights are turned on my left turm signal doesnt work. When the headlights are on the left turn signal indicator lamp is lit. My right turn works with the headlights on. Both signals work with the headlights off. My hazzards work no problem with the headlights off. But with the headlights on and the hazards on they don't blink just the indicator lamps stay lit. The socket has a good ground. When the headlights are on both the running light and the turn signal contact have power. It is not the bulb front or rear. Really stumped here. Any help or advice would be awesome.
Lead Driver
Joined: Jul 2011
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From: On the Edge of the Desert
Headlights? Or marker lights? If it's with the marker lights on then I'd start looking at the tail light situation.
If it's with the actual headlights, then you have some weird wiring going on somewhere. I don't know what to tell ya.
If it's with the actual headlights, then you have some weird wiring going on somewhere. I don't know what to tell ya.
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The turn signal is in the marker lights. But when I turn on the headlights. My left turn doesn't work and has constant power. I did not test the rear. I know that with headlights off everything works as it should so I know all the bulbs are good. Think it's more taillights? I had all the bulbs out , headlight, tailight, marker light. And the indicator still stayed lit. So it seems to be wiring more than anything or possibly a switch?
Hotshot
Joined: Mar 2013
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From: Phoenix, Az.
The turn signal is in the marker lights. But when I turn on the headlights. My left turn doesn't work and has constant power. I did not test the rear. I know that with headlights off everything works as it should so I know all the bulbs are good. Think it's more taillights? I had all the bulbs out , headlight, tailight, marker light. And the indicator still stayed lit. So it seems to be wiring more than anything or possibly a switch?
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Fleet Owner
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From: Central PA
I think they were in 1970. The parking lights are on on my 70 F350 when my headlights are on....
Hotshot
Joined: Mar 2013
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From: Phoenix, Az.
OP, has someone messed with the turn signal switch, one of those junk switch rebuild kits, or the under dash wiring recently?
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I wired in a 1979 steering column with tilt. Drove the truck had no issue truck sat for a week then had the issue. I found the issue out when I was fixing the bad ground issue for one of the headlights. I have the issue with the marker lights on and with the headlights on. I disconnected the steering column and turn the headlights on and still the left indicator lamp and front left turn signal and rear turn signal have power. So I have ruled out the turn signal switch. Some how the left turn is getting a constant hot with the headlights and marker lights on.
Hotshot
Joined: Mar 2013
Posts: 14,255
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From: Phoenix, Az.
I wired in a 1979 steering column with tilt. Drove the truck had no issue truck sat for a week then had the issue. I found the issue out when I was fixing the bad ground issue for one of the headlights. I have the issue with the marker lights on and with the headlights on. I disconnected the steering column and turn the headlights on and still the left indicator lamp and front left turn signal and rear turn signal have power. So I have ruled out the turn signal switch. Some how the left turn is getting a constant hot with the headlights and marker lights on.
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Dome lights work, turn signals work when headlights are off. Brake lights work. Hazzards work as long as the headlights are off. Dash lights work but are touchy with the dimmer. When the head Lights are onthe dash lights come on like normal, but the left turn indicator lamp is on . Now if I dim the dash lights the left turn indicator lamp dims too.
Hotshot
Joined: Mar 2013
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From: Phoenix, Az.
Looks like the only thing in common with all those problems is the dash cluster's printed circuit board. According to my aftermarket 1971 wiring schematic. Have you had the cluster out recently or messed with the wiring going to it? Here is one for a 1970.
