Alright, a lot has happened with the truck since I last commented on here. My truck is a 1998.5 slt Laramie(I have the pull out headlight switch), everything I read online says it comes with foglight wiring. I bought a set of 4 led pods, 2 fog light relays(as my PDC had the slots and 12v power running to them, I used a test light to check for power) I installed the 10amp fuse for the drl lamp spot as it was missing for some reason but was also hot. My trick has a plug in the center underneath the radiator. I went to the salvage yard and found a truck with some foglight wiring but it was 2 prong plug, and I found a truck with a 3 prong plug like mine but just the plug as the wires had been cut. I know I can just run them to the battery and then to a switch, but I want it to be as factory as possible. The 1998 foglight/airbag switch is discontinued so I was going to try and wire my low beam power to the relay which would then send power to the foglights when low beams are on. So my question is, is this 3 prong plug correct or am i SOL? And if it is correct what other fuses/relays do I need to install in PDC or fuse label in cab to send power to fog lights while low beams are on. I know I would have to splice atleast 1 set of wires.

Edited January 5, 20196 yr by Waydin_Stewart

@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.

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.

Fluke multimeter reads 42.3 ohms

1 minute ago, Marcus2000monster said:

Fluke multimeter reads 42.3 ohms

For what?

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...

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.

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

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.  

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. 

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

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?

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

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.

 

 

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.  

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! 

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. 

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

Ohm test yields 36 ohms. 

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, 20196 yr by IBMobile

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!

Don't feel bad. @pepsi71ocean called me and asked about TIPM on another Dodge product. He found both headlight bulb was blown and the TIPM module needed to be hard reset. Now works fine.