Foglight wiring issues

[IBMobile]

Yes, but I would look for an open circuit between and including the head light switch to the lights.  The ground G201 can still ohm tested when the head light switch is accessed. 

[Marcus2000monster]

@IBMobile Sprry I didn’t reply yesterday I was really busy at work. Hoping to to some more diagnostics tonight. Thanks!

Also I can’t get the fogs to come on at all anymore.

[IBMobile]

5 hours ago, Marcus2000monster said:

Also I can’t get the fogs to come on at all anymore.

Good, a complete constant failure is the best when doing diagnostics on this type of problem.

[Marcus2000monster]

Fluke multimeter reads 42.3 ohms

[Mopar1973Man]

1 minute ago, Marcus2000monster said:

Fluke multimeter reads 42.3 ohms

For what?

[Marcus2000monster]

Just now, Mopar1973Man said:

For what?

orange and black fog lamp wire. According to @IBMobile This confirms i have a bad ground. Just need to know where its at...

[dripley]

6 minutes ago, Marcus2000monster said:

orange and black fog lamp wire. According to @IBMobile This confirms i have a bad ground. Just need to know where its at...

If it was up your arse you would know where it was.

 

 

 

Sorry, i could not resist that one.

[Marcus2000monster]

Found 2 more orange/black wires. One tested 4.5 and the other tested 2.2 ohms

[IBMobile]

Almost all the ground wires in the truck are black with orange tracer.

The only black/orange (BK/OR) wire to check in the fog light system is the one from the headlamp switch to G201.  The other two wires to check are the light blue (LB) from the fog lights to the relay and the brown/yellow from the relay to the headlamp switch.  Recheck the wire diagram, if you need to, as to were the wires go.  

[Marcus2000monster]

5 hours ago, IBMobile said:

Almost all the ground wires in the truck are black with orange tracer.

The only black/orange (BK/OR) wire to check in the fog light system is the one from the headlamp switch to G201.  The other two wires to check are the light blue (LB) from the fog lights to the relay and the brown/yellow from the relay to the headlamp switch.  Recheck the wire diagram, if you need to, as to were the wires go.  

The wire diagram makes no sense to me at all. 

[Dieselfuture]

Pull the headlight switch out disconnected from wires and shake It,  can you hear anything rattling loose inside

[Marcus2000monster]

20 minutes ago, Dieselfuture said:

Pull the headlight switch out disconnected from wires and shake It,  can you hear anything rattling loose inside

I have tried a new switch and it didn’t work so returned it to NAPA. I’ll try and see if I hear anything though. If I pull the fog relay and with the key on probe the relay sockets with a MM or test light thy should tell me if I have a bad wire between the switch and Pdc right?

[Dieselfuture]

I'm as good in wireing as you are, most of it goes right over my head if it has to do with more than one wire

[Marcus2000monster]

6 minutes ago, Dieselfuture said:

I'm as good in wireing as you are, most of it goes right over my head if it has to do with more than one wire

Dude I know like the diagram are no help to me because I can’t read them and they don’t tell me where the wires are.

[IBMobile]

 

 

In the PDC remove the fog light relay.   With the head light and ignition switches in the off position there should be  voltage at terminal #30.  With a jumper wire ground terminal #30, the fog lights should come on.

 

Turn the head light switch on and select low beam, there should be battery voltage at terminal #86.  Now select high beam, there should be no voltage to terminal #86.

 

With the head light switch and fog light switch both turned on Ohm test terminal #87 then terminal #85, both should have a reading of less than 5 ohms.

 

Terminal #87A doesn't do anything so it is blank.  

[Marcus2000monster]

59 minutes ago, IBMobile said:

 

 

In the PDC remove the fog light relay.   With the head light and ignition switches in the off position there should be  voltage at terminal #30.  With a jumper wire ground terminal #30, the fog lights should come on.

 

Turn the head light switch on and select low beam, there should be battery voltage at terminal #86.  Now select high beam, there should be no voltage to terminal #86.

 

With the head light switch and fog light switch both turned on Ohm test terminal #87 then terminal #85, both should have a reading of less than 5 ohms.

 

Terminal #87A doesn't do anything so it is blank.  

Thanks that is much more simplified! 

[Marcus2000monster]

On 1/18/2019 at 7:34 PM, IBMobile said:

 

 

In the PDC remove the fog light relay.   With the head light and ignition switches in the off position there should be  voltage at terminal #30.  With a jumper wire ground terminal #30, the fog lights should come on.

 

Turn the head light switch on and select low beam, there should be battery voltage at terminal #86.  Now select high beam, there should be no voltage to terminal #86.

 

With the head light switch and fog light switch both turned on Ohm test terminal #87 then terminal #85, both should have a reading of less than 5 ohms.

 

Terminal #87A doesn't do anything so it is blank.  

Hoping to have time to figure this out tonight will report back. 

[Marcus2000monster]

Ok I have voltage at 30. And the lights do not come on when I ground 30 . 

Ohm test yields 36 ohms. 

[IBMobile]

1 hour ago, Marcus2000monster said:

Ok I have voltage at 30. And the lights do not come on when I ground 30 .

That is because the system is still getting 12V from the park light circuit which powers up the light in the head light switch.  I forgot about that.

 

 

  When you ground #30 look at the head light switch ; you'll see the little blue fog light in the switch is on.  Now pull the park light fuse and it should go out and no voltage to #30.   If this is the case and you still have 12V from the fog light fuse to the fog lights then there is an open grounding circuit between the fog lights and the relay terminal #30.

 

 

Edited January 22, 2019 by IBMobile

[Marcus2000monster]

1 hour ago, IBMobile said:

That is because the system is still getting 12V from the park light circuit which powers up the light in the head light switch.  I forgot about that.

 

 

  When you ground #30 look at the head light switch ; you'll see the little blue fog light in the switch is on.  Now pull the park light fuse and it should go out and no voltage to #30.   If this is the case and you still have 12V from the fog light fuse to the fog lights then there is an open grounding circuit between the fog lights and the relay terminal #30.

 

 

Thanks again for those. I feel dumb but I replaced the bulbs and now they work!