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Old 02-16-2011, 10:10 PM
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Question for the guys who put HIDs in the fogs...

I received my XenonDepot 5202 (H16) kit today. The kit comes with an optional relay wiring harness as well.

Question: Do I NEED to utilize the relay or can I just plug the OEM fog light plug into the HID ballast, since all the ballast needs is +12 and ground.

I assume the OEM fog light wiring is already fused and relay'ed, no? If so, I don't see the need to run an additional +12 and a relay.

Thanks in advance...

Peter
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Old 02-16-2011, 10:15 PM
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Re: Question for the guys who put HIDs in the fogs...

I would just for safeties sake
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Old 02-16-2011, 10:52 PM
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Re: Question for the guys who put HIDs in the fogs...

Quote:
Originally Posted by Scottina06 View Post
I would just for safeties sake
I'm totally with you Scott...just hate running wires where there aren't supposed to be any...

From my research on the net:

Most aftermarket HID kits require relays because the starting load is approximately 15 amps per ballast. Halogen lights require a 7 amp starting load, so typical OEM headlight circuits are designed to support 7 amps starting load and 4.5 amps continuous load. Repeatedly pulling a combined 30 amps on fire-up on a system designed to handle 14 amps on fire-up could clearly hurt the truck's electronics.

HOWEVER...the Xenondepot HID kit I bought has a <4.5 amp starting load, per ballast (according to Xenondepot's spec page). So, that's a 9 amp starting load on a system designed to handle a 14 amp starting load.

In theory, I SHOULD be ok, right?
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Old 02-16-2011, 11:36 PM
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Re: Question for the guys who put HIDs in the fogs...

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Originally Posted by pbalias View Post
I'm totally with you Scott...just hate running wires where there aren't supposed to be any...

From my research on the net:

Most aftermarket HID kits require relays because the starting load is approximately 15 amps per ballast. Halogen lights require a 7 amp starting load, so typical OEM headlight circuits are designed to support 7 amps starting load and 4.5 amps continuous load. Repeatedly pulling a combined 30 amps on fire-up on a system designed to handle 14 amps on fire-up could clearly hurt the truck's electronics.

The Xenondepot HID kit I bought has a <4.5 amp starting load, per ballast (according to Xenondepot's spec page). So, that's a 9 amp starting load on a system designed to handle a 14 amp starting load.

In theory, I SHOULD be ok, right?
I would just use it, remember, not all power will be used from your headlights. You need to look at headlights, fogs, stereo, heater....etc etc..You use up a lot of juice to start your hemi.

I would use the relay, then you will know it will work
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Old 02-16-2011, 11:46 PM
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I agree with the OP - if they actually run at an initial and sustained current draw of less than the stock bulbs there is no need to run a new wire. I hate running wires if I don't have to. It would be good to get specifics of the actual stock bulb and not the typical one.

Current draw of all the other things have nothing to do with this fused circuit (unless they are actually on the same fuse, which I doubt).
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Old 02-17-2011, 09:40 AM
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Re: Question for the guys who put HIDs in the fogs...

Saturday I'm going to use my Power Probe III and do a load test on the halogen fog lights. I'll check the load on initial turn-on, sustained load, and vlotage drop when all the accessories on the truck are turned on. Then I'm going to do the same for an HID ballast.

If the HID ballasts require less amperage then the hallogen bulbs, in theory there's no need for additional relays and fuses aside from the OEM circuit.
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Old 02-17-2011, 01:28 PM
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Re: Question for the guys who put HIDs in the fogs...

Run the relay also to save yourself some time you are going to have to shave one of the small guides on the 5202 otherwise the bulb won't fit.
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Old 02-17-2011, 01:45 PM
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Re: Question for the guys who put HIDs in the fogs...

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Originally Posted by RyeGuy View Post
Run the relay also to save yourself some time you are going to have to shave one of the small guides on the 5202 otherwise the bulb won't fit.
RyeGuy is correct however, if you shave them all off it seems to go in even better...just my experience....but a minimum you have to do the one that is by itself (i.e. there are two on one side and one opposite).
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Old 02-17-2011, 02:36 PM
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Re: Question for the guys who put HIDs in the fogs...

Thanks guys for the heads up on that. I was looking at pictoral comparissons of the bulbs and noticed that.
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Old 02-17-2011, 03:17 PM
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Re: Question for the guys who put HIDs in the fogs...

Oh...and regarding the RELAY issue, I might have answered my own question:

The OEM fog light bulbs are the PSX24W. They're 24W. Using the calculation:

I (amps) = P (wattage) / E (batt voltage), the OEM load is around 2 amps per bulb at 12 volts (vehicle not running), and 1.76 amps at 13.6 volts (vehicle running).

The HID's (per ballast) require < 4.5 amps at startup and a little less while running. Thats double the draw of the OEM hallogens.

In my second post above, I used incorrect figures for our fog light circuits. I used the figures for a 55W fog light bulb, thus throwing off the TRUE current draw.

Verdict: I'm using the relays.

And here's some interesting info on the PSX24W in case anyone's interested:

http://www.wbbr.nl/projects/philips/site/cms/productmodule/pdf/Pis_558%5B1%5D.pdf
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Old 02-20-2011, 05:59 AM
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Re: Question for the guys who put HIDs in the fogs...

Let us know how it goes. Any pictures of then kit and install would also be helpful as I am also consider making this mod. Thanks!
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Old 02-20-2011, 10:47 AM
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Re: Question for the guys who put HIDs in the fogs...

pbalias:

Are you installing these in WK2?
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