which wire?

[Cleaner Man]

I am installing a set of running lights on my '97 Standard.  I know that i want to wire my my relay to the blue wire w/white line (in the headlamp bowl).  Problem is that I've got two blue wires w/white lines in there.  One wire is lighter than the other...which is the one I've hooked up to.  thanks for the help!

[98valk]

should have what your looking for

http://www.rattlebars.com/valkfaq/

[John Schmidt]

If so...big mistake, you need to wire them totally separate from the headlight. Reason being, if the headlight circuit or bulb(s) go out, you still have your driving lights to get you home. Plan on that happening a long way from home and at night....usually with no moonlight available.

[tivoklr]

What is a good wire to use then to provide switched power to the relay besides the light circuit?

The PO wired my driving lights right into the ignition circuit without a real relay, and now I'm replacing melted connectors at the ignition switch and starter relay (oh and I got stuck dead 100 miles from home).

[BuzzKill]

Ive got a relay switched powered accessory fuse block I installed.  Ive already got my horn hooked up to it, next Im going to be installing my running lights to it. 

The main power comes from the battery, but its only on when the switch is on through the accessory plug going to the relay.  That might be another option, but would require more wiring.

[DFragn]

What is a good wire to use then to provide switched power to the relay besides the light circuit?

The PO wired my driving lights right into the ignition circuit without a real relay, and now I'm replacing melted connectors at the ignition switch and starter relay (oh and I got stuck dead 100 miles from home).

Any switched circuit as long as you use a relay. i.e. accessory leads, front running lights, etc.
As noted, avoid using the headlight circuit. In case of failure you still have lights. And if your tied into the headlight circuit [depending on which end of the circuit] your driving lights may not power down for start-up if they're switched to ON prior to hitting the button.
Many have added a switched fuse block [relayed] for multiple accessory management from the OE accessory leads.

[Cleaner Man]

Thanks for the good advise.  I installed a fuse block, and ran both my relay wire for the lights (15 amp), and the switch wire to it (5 amp fuse).  I wired the fuse block to the top screw of my fuseable link.  I know that i run the risk of leaving running lights on because of the way i hooked them up- but the switch has a bright LED, and I don't think i will have a problem.