Hella install on roof rack

Tugela

Well-known member
May 21, 2007
4,766
566
Seattle
Washington's governor extended the stay at home order for another month so my thoughts are turning to my piles of spare parts in the garage. I recently put a Voyager XD full-length roof rack on my D1 and it came with 4 Hella Rallye 3000 halogen 55-watt lights. I already have a pair of factory Safari 5000 lights on my brush guard so I thought I didn't need more lighting. Seeing as they aren't doing anything in my garage and I need a new problem to occupy me, I'd like to install them.

There are some threads on this topic in the Discoweb archives, such as this one as well as the wiring diagrams in the old tech section. This write-up details another approach, but I don't think I want to replicate all aspects of it. I wired up my Safari 5000 lights with some help from a friend who's an electrical engineer but before I ask for his assistance again I want to make a plan and find the right parts.

Requirements:
I want to be able to operate the roof lights independently of the headlights, I want a quick disconnect close to the lamps so I can remove the roof rack easily when needed, I want all 4 lights to operate from a single switch, and I want a clean finished installation.

Planning questions:
  • Where and how to route the wiring?
  • Where and how to set up the switch?
  • What parts do I need?
Where and how to route the wiring

The two most obvious choices seem to be
  • Along the exterior of the A-pillar
  • Along the interior of the A-pillar
Exterior: I've read of other owners running the wires along the weather stripping on the outside of the A-pillar (presumably driver's side?). I haven't seen any close-up photos of how this looks. How do you fix the wiring in place? While it sounds like a simple option I don't know if I would like it. I'm curious to hear feedback from folks who have done it this way. What do you like about it, what would you change if you did it again?

Interior: This being the XD low-profile rack, I removed the factory roof rails and filled the holes in the roof with the recommended Steele Rubber grommets. I could drill a hole in one grommet (presumably driver's side) and run the wiring under the headliner, down the inside of the A-pillar trim panel, and behind the dash through the same firewall grommet I used for the Safari 5000 lights. This would keep most of the wiring out of sight, but then I'd always have a section of wiring sticking out through my roof when I disconnected the lights and removed the roof rack. Which won't be often.

Discussion question: what are the pros and cons of each approach? What have you done and what works well/doesn't work well? Please post photos if you have them.

Setting up the switch

I wired my Safari 5000 lights to a spare latching factory fog lamp switch that I installed in the blank slot next to the original fog light switch. I have been happy with this setup. One option would be to remove the cruise control switch (I never use it) and use that slot for the roof lights, installing another spare fog light switch in its place (or just re-using the cruise control switch). I'm leaning towards this, but if anyone has a better idea I'm open to suggestions. How do I set up the wiring so the single switch operates all 4 lights?

Parts needed

Here's a photo of a light with the connections.

IMG_20200404_100325.jpg

This is the wiring kit I bought for my Safari 5000 lights. Any reason that this wouldn't work for the Rallye 3000 lights? Same wattage, I believe. I would need a pair of these kits. Is there a better kit I should consider?

Finally, if I wanted to also add a rear work light at the same time, what would be a good option and what is the best way to wire that up? I don't like the routing through the cargo door opening, it seems inelegant. Maybe this is a project for another time.

rear work lamp wiring.jpg
 

bendts

Well-known member
Jan 27, 2015
277
18
Farmland
I ran my wires for the roof rack up inside the passenger a-pillar. just had to drill a big enough hole in the top part to get wires out. Used the passenger side as it was closer to the battery and the relays - and you want to keep the wires as short as poss in a 12 volt system. I have 2 relays - 1 for each pair of lights, connected to 2 switches.

As for the rear light - just run the wires along the rack to the same entry point on the a-pillar cover and to the power from there.
 

luckyjoe

Well-known member
Oct 10, 2004
462
129
New Jersey USA
Since the roof rails are removed, can you install a connector/strain-relief at 1-2 of these pre-existing holes? Then you can easily disconnect when you remove the rack.
 

robertf

Well-known member
Jan 22, 2006
4,799
366
-
Here’s how the “factory” did it
43C25589-F84F-4BEA-A619-6DE1FDB8C200.jpeg
hole in middle of roof gooped up with silicone

7F073AFF-DFEB-41D2-A787-C67A6117585B.jpeg

E2AED2AB-73E3-424E-AEA2-3170FA7FD289.jpeg

Fuse panel and relays under hood
9E88144A-D68B-48C5-BF84-A1D4017852C9.jpeg

97 event trucks were a little more thought out and had it run up the snorkel with zip ties and the wiring behind the glovebox. Switches were on the binnacle

56D3B3C7-C151-4E19-B38A-C2BF4F895145.jpeg
CEF5255E-142B-4967-8E1C-5C705891907D.jpeg

both used lucas e-series connectors at the lights
 

robertf

Well-known member
Jan 22, 2006
4,799
366
-
And shameless plug, an easy way to add 1 switch without losing something else
1588138134573.jpeg


 

Tugela

Well-known member
May 21, 2007
4,766
566
Seattle
Thanks, Robert, that's more along the lines of what I'm going for. I already have the holes in the roof. If I can use my factory cruise control switch (or swap another fog light switch into that slot) I'd prefer that. Going to start ordering parts in the next week or two.
 

Gordo

Well-known member
. On our 96 we used a fog light switch for the rack lights out of A parts truck and swapped it out with one of radio switches on the instrument panel. Gotta use a relay to protect the switch but looks clean. The bull bar lights are wired to the originals fog switch by the cruise control
 

jymmiejamz

Well-known member
Dec 5, 2004
6,010
362
35
Los Angeles, Ca
The roof lights on my wife's D1 are wired to a bank of three factory switches in place of the ash tray (I think) on the passenger side. One switch is for the two center lights (pencil beam), one for the outer lights (cornering beam), and one for the work lamp in the rear. It doesn't have roof rails and the wiring was run through one of those holes.
 
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KorytheLorry

Well-known member
Feb 1, 2020
51
12
Maryland
I just did a similar project: 4x Wipac 4x4 100W halogen lights mounted to my SD rack, operated with a single switch. I can take some pictures and also send you a parts list. I bought all required electrical parts (wire, switch, relays, connectors, braided nylon sleeving, fuse components) from Digikey. Depending on the current ratings of the relay and wire you choose, you can use either 1 or 2 relays for your lights. In either case, all lights can be operated with a single switch. I routed the harness up the outside of the driver's side pillar, zip tying it to my snorkel to keep in place. For now my relay connections are not hermetic, but I have an appropriate IP67 (water & dust-proof) connector to employ in the future. I can have all the info together sometime this weekend.
 
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Tugela

Well-known member
May 21, 2007
4,766
566
Seattle
I just did a similar project: 4x Wipac 4x4 100W halogen lights mounted to my SD rack, operated with a single switch. I can take some pictures and also send you a parts list. I bought all required electrical parts (wire, switch, relays, connectors, braided nylon sleeving, fuse components) from Digikey. Depending on the current ratings of the relay and wire you choose, you can use either 1 or 2 relays for your lights. In either case, all lights can be operated with a single switch. I routed the harness up the outside of the driver's side pillar, zip tying it to my snorkel to keep in place. For now my relay connections are not hermetic, but I have an appropriate IP67 (water & dust-proof) connector to employ in the future. I can have all the info together sometime this weekend.

I am putting together a shopping list and would be grateful to see what you used. I have no snorkel and no plans for one, so I'm leaning towards interior cable routing. I'm going to put in a rear work light while I'm at it because I only want to do this once.
 

KorytheLorry

Well-known member
Feb 1, 2020
51
12
Maryland
OK sorry for the delay. I hope this is still helpful.

First a wiring diagram:
Screen Shot 2020-05-07 at 1.06.33 PM.png


Next a partial parts list (missing items include wire, plastic sleeving, and spade connectors that I had laying around) with Digikey part numbers.

1) Nylon sleeving (to protect exterior harness):
NMN0.38BK125
1030-NMN0.38BK125-ND
SLEEVING 0.375" ID POLY 125' BLK
Shipped By: Digi-Key

2) Waterproof connector: bulkhead side (if I were to run the main harness on the interior, this would be my feedthrough to the outside world)

ACD-07PMFS-SC7001
1754-1345-ND
MIDDLE STAMPING PIN
Shipped By: Digi-Key

3) Waterproor connector: harness end (this connects to the feedthrough harness)
CD-07BFMA-SL7001
1754-1421-ND
MIDDLE
Shipped By: Digi-Key

4) Inline fuse holder - 30A (this can be used for all 4 of your lights with margin)

74-IFHA30
2368-74-IFHA30-ND
IN LINE FUSE HOLDER
Shipped By: NTE Electronics, Inc

5) Relay - 30A (this can be used for all for with margin)

1432772-1
PB685-ND
RELAY GEN PURPOSE SPST 30A 12V
Shipped By: Digi-Key

6) Lighted rocker switch

RB2-1A-DC-2-RL
2299-RB2-1A-DC-2-RL-ND
SCRW MOUNT OFF-ON RED LEDDC
Shipped By: Switch Components

7) Relay socket (I didn't end up using since I had some spade connectors laying around, but otherwise would have)

VCF4-1000
PB232-ND
RELAY SOCKET 5 POS THROUGH HOLE

And finally pictures of the install.
IMG_3597.JPG
Shown here is a ring terminal crimped to the inline fuse holder. You want this as close to the battery as possible. I routed it to the fuse box and connected it on the battery side of the main.

IMG_3598.JPG
In black plastic sleeving is the fused main power wire for all the lights. I routed it in front of the battery, then across the vehicle in front of the radiator.

IMG_3600.JPG
Here it is coming out the other side and running along outside of engine bay.

IMG_3602.JPG
Here's the relay installed. If I were running the harness through the interior to a hole in the roof, I'd probably install it on the inside of the vehicle. The harness that powers the lights then runs through the hole at top center and then up the snorkel.

IMG_3606.JPG
It's a little hard to see, but I ran the switch wire through a blank feedthrough in the bulkhead. You can see a single blue wire running between the transmission harness and the light power harness.

IMG_3594.JPG
Here's the temporary switch position. Eventually I will install one next to the factory fog light switch.

IMG_3593.JPG
And the finished product. I soldered all connections on the exterior and used heat shrink and the nylon sleeving to protect the wires.
 

Tugela

Well-known member
May 21, 2007
4,766
566
Seattle
Great resource, thank you for taking the time to post such a detailed overview of parts and process. This will be very helpful.
 

bendts

Well-known member
Jan 27, 2015
277
18
Farmland
I would use 2 relays - 1 for each pair of lights. That way you will not overload the relays in any way... and if 1 relay happens to take a shit, the other will still work and you will still have 2 lights working.

2 is 1, 1 is none.