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You will need a relay, capable of handling 10A, a breaker (or fuse) that is also 10A, and some automotive power wire of at least 14 awg.
Run a wire from the positive (+) side of your battery (at the starter solenoid if you can access it), to one side of the breaker, and run the other side of the breaker to the primary side of the relay. Shelter all exposed terminals from contacting the chassis. The relay output wires directly to the positive side of the daytime running lights (with the - side of the daytime running lights to chassis for ground), one side of the relay coil to any ignition-switched power source (solenoid ignition connection will work), and the other side of the relay coil goes to chassis ground.
The daytime running lights will automatically turn on when you turn your ignition key on, and will turn off when you turn the key. Using this relay arrangement helps isolate them from other circuits, which they may otherwise overload.
The problem with HID lights is that they require 12 volts or more to work. Daytime running lights on require 6-9 volts from the module. So when the original lights are replaced, the daytime running lights will not supply enough voltage to the HID ballasts to turn them on. The result? No Daytime Running lights. Another alternative is to purchase LED strips and place them around your headlights with a fused accessory power from the ignition switch. When the car is on the strips light up and you have Daytime Running Lights!
follow the wires to the drl relay. It must be inline from the regular light switch to the headlamps. I have a 1990 Cadillac Deville that has an aftermarket module that controls the daytime running lamps, and it is mounted on the driver's side wheel well.
Some relays are found in the fuse box under the hood.
If your daytime running lamps burnt out, take it to an electrical shop and ask them to check it out.
If you buy an aftermarket daytime running lamp kit, they can install it for you.
But, I agree, you should check for voltage and function at the relay for the daytime running lamps on your Astro.
But, if all else fails, the electrical shop should be able to diagnose and repair this problem.
I have a 1997 cadillac deville that has both 'daytime running lamps' when put into gear and 'twilight sentinel' which turns the headlamps and parking lamps on at night, and goes off during the day or when it is bright enough.
There is an adjustable delay for the twilight sentinel to turn the headlights off after the ignition key is removed and it is night time.
I had the 'daytime running lamps' installed on a 1990 Cadillac Deville that turns the headlamps only on when the ignition key is switched to on with an aftermarket module. The headlamps are about 70% or so as bright as the regular twiilight sentinel headlamps and parking lights and are designed to go on during the day.
The twilight sentinel overrides this feature when it gets dark outside.
I had the daytime running lamps installed by an auto electric shop that specializes in electrical systems, alarms, stereos, etc.
Also, the daytime driving lights are controlled by relay. It's possible the relay may have melted down inside and is shorted, remaining on even when primary ignition power is off. The relay runs about $15.00 to $20.00 USD and might be worth a shot to replace. Likely you can get one at a recycling yard for a dollar or two.