2nd Gen Non-Engine/Transmission Can the factory fog light switch and or circut handle PIAA 510's

[BigDan]

Pretty much sums it up. Since I just bought a new headlight switch and would rather not run the factory PIAA switch. That and will the factory harness be able to handle the 510's it I just plug in the 510's at the factory harness in the bumper.



Thanks

 

[Chipstien]

When you buy Piaa 510's it will come with it's own wire harness and relay. Just use BOTH the + and - wires in the factory harness to switch the relay for the 510's.



No the switch would not last with more load than 35 watt fog lights. Use the supplied relay and harness.

 

[B.G. Smith]

Originally posted by BigDan

Pretty much sums it up. Since I just bought a new headlight switch and would rather not run the factory PIAA switch. That and will the factory harness be able to handle the 510's it I just plug in the 510's at the factory harness in the bumper.



Thanks

I don't know what the amp load of the PIAA lights is but it will not put more load on the switch as the lights are run through the relay in the PDC. If the load is too high then use of the relay as sugested above with a seperate power supply would solve the problem. bg

 

[DF5152]

you can use the factory switch to trigger the PIAA relay...

 

[Thomas]

Re: Re: Can the factory fog light switch and or circut handle PIAA 510's

Originally posted by B. G. Smith

I don't know what the amp load of the PIAA lights is but it will not put more load on the switch as the lights are run through the relay in the PDC . . .

Model years 2000, 2001, and 2002 use the foglamp relay in the PDC as an interlock, preventing foglamp use with high beams. The relay is not used in the classic way that allows a small current to control a large current. When the headlamp switch is in the foglamps on position and the beam selector is in the low beam position, the contacts in the foglamp relay are closed. Switch the beam selector to high beams and these relay contacts open.



All of the current that passes through the fog light filaments also passes through the fog contacts in the headlight switch.



I suspect model year 1999 is the same.



I go along with DF5152's solution.

 

[BigDan]

So i can use the folgight switch to trigger the PIAA relay. Isnt like a switched groung system or it doesnt matter. Which wires do i cut into and where???



thanks

 

[Thomas]

I only have wiring diagrams for model year 2000-2002 switched-ground setups. I can't help with specifics on your 1999 Ram.



The main part of my post was to let you know that all fog light current will pass through the fog light contacts in the headlight switch in the OEM setup. A look at the 1999 and the 2000 & 2001 modifications near the bottom of this page should convince you that the relay is only an interlock. The modification for 1999 is identical to the modification for 2000 & 2001. If the relay were used to take the load off the headlight switch the jumper would cause the fogs to always light, regardless of the position of the in-cab switches.