Sport H/L's High/Low

[Tardog]

I got a set of sport H/L's to replace the crap in my truck. I 've been having a hard time finding info and dealers have been not very forth coming. How do these things operate? What I mean is

1- on low beam which bulbs and filimants are working?

2- on high beam which bulbs and filimants are working?

inside bulbs or marker side?

Has anyone done this conversion with a daytime runner module attached (canadian trucks come with these)? I know I can unplug the module and then use the existing wiring circuit to activate a set of relays to run the highs/lows. But I need to know which is which? Many thanks,

 

[BCFAST]

Contact redneckdr... he's got some wonderful instructions for retro-fitting the sport lights.

 

[Cummins Corvette]

I have mine wired so both bright filimants come on with the high and both of the dim ones come on with the low.

 

[Fireman]

Tardog,



On my Sport the outside bulbs ( those closest to the turn signal lamps) burn on low beam. All four burn on high beam. How are they wired? I don't know.



Hope this helps somewhat

Fireman

 

[Cummins Corvette]

Fireman- is yours a stock sport??

 

[Tardog]

Ok now we know how they burn, but which filiments are burning on high? 2,3, or 4. I just can't figure it out with 4 filiments if only 1 filiment on the outside burn on low does this mean that the other 3 burn on high? Thanks,

 

[Cummins Corvette]

I don't think that fireman is right on that one. Reason being that I went outside and tried to drive with just the outside ones hooked up and it didn't work so well. I couldn't see much of anything without the inside ones lit.

 

[Tardog]

Cummins Cor



I think he's right with the outsides on lowbeam, saw a sport go by and those were the ones lit up? I know i've seen it here on other posts but the search is wearing me out:

 

[Cummins Corvette]

 

[redneckdr]

filaments lighted on Sport lights

On the sport lights, OEM configuration, one filament of the outboard (9007) bulbs, and one filament of the inboard (9004) bulbs is lighted on high beam. on switched ground trucks, this is achieved by grounding the "C" wire/terminal on the 9007's, and the "C" wire/terminal on the 9004's.

Low beam has only one filament lighted in OEM configuration, the "A" wire/terminal on the outboard(9007) bulbs is used for that.

that means that in OEM configuration, one filament in the 9004's isn't used ("B"). some have hooked it up with low beam (no experience). some have used it for a DRL on US trucks.

on 9007 bulbs the "common" wire/terminal is "B". on 9004 bulbs the "common" wire/terminal is "A". on switched ground trucks, these wires/terminals are constant 12v+.

i don't know how the DRL Canadian trucks are wired to achieve this. haven't had one in my hands to tear up... ... ... .

 

[Tardog]

my guess that the one filiment not used is for the Canadian day time runners. looking at the back of these bulbs can someone explain which terminal is a-b? thanks to all. I shall proceed with tearing up a canadian set up. Any input into running all 4 filiments on high/low?

 

[redneckdr]

"A" wires/terminals.........

are the ones on the driver's side, with the socket flat side up. if you look at the sockets by themselves, you'll see that the sockets are interchangeable on the 9007 and 9004 bulbs. you can't interchange the bulbs, however, because the wiring internally in the bulbs is different (won't light right), and the locking tabs are different so the bulbs won't go in the units, interchanged.

i'd be concerned about burning all four filaments on high because of the heat generated. with heavy wiring, i have plenty of light down the road with two filaments lighted on high. try that first, then add the other later???? if you feel necessary.

FWIW high watt bulbs generate more heat, and may melt things... ... ...

 

[Fireman]

Chris my truck is a stock Sport.



Fireman

 

[Cummins Corvette]

Wow!! I don't know how you can see with only the outside ones on. That seems totally dangerous. I can't see worth a darn without all 4 bulbs on.

 

[redneckdr]

low beams

IF you upgrade the wiring, i think you would find that you don't need all the filaments lighted to see. my high beams with one filament lighted in each bulb apparently cause oncoming drivers problems at about a mile away, 'cause that's where they start flashing their lights at me. low beams with one filament lighted in the outboard lights seem quite adequate. i also wired the fogs independent, and leave them on most of the time, both with highs and with lows.

 

[Tardog]

rredneckdr,



your right about the wiring, I read an interesting artical here and also in a book that with a very small voltage drop at the bulbs the light output Significantly drops. I can't quit remember the #'s but something like a . 02 drop in voltage can be a 25% reduction in light. (don't hold me to these #'s). Most vehicals can increase their light output substantialy by just increaseing wire size. I can't believe the tiny wire they use on these trucks. Cheers

 

[redneckdr]

wiring

yeah, the wiring for the lights is 20 ga on the left and 18 on the right--gimme a break. inadequate, if not dangerous. i rewired with 12 ga supply and 10 ga ground. you will note, that i changed the system from a switched ground system to a combined switched ground, switched 12v+ system. the original switched ground switches the relays, which in trun switch 12v+ to the lights. that is wired with 12 ga wire, and the grounds from the "commons" on the bulbs is 10 ga back to batt (-).