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NFIN02

Member Since: 17 Feb 2022
Location: Londonderry
Posts: 95

1989 Defender 90 300 Tdi HT Chawton White

Spotlight wiring question

Just bought 4x britpart 8’’ spotlights for my expedition roof rack. Have them mounted but I am useless with wiring. Each light has 2 bullet connectors, can I get specific harness or will I need to make up my own. Each night is 100watt. Some lady bird guidance required please. I have already a switch, relay and fuse set up, just need help with connecting lights together

4th Feb 2024 3:50pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19621

400w load total @ 12.2v = 32.78A Current Approx

You should be able to use 1mm2 cable for each individual spotlight wiring in parallel, but the supply I’d recommend 4mm2.
1mm2 supplying each spotlight, but the supply incoming 4mm2.
Use 4mm2 for the main ground also.

Automotive thinwall cable would be ideal, don’t forget to use a 40A make break 4 pin, type B, Normally Open contacts, Relay, and I’d fuse at 35Amp ATO within 20inch max of the battery live or source of the power supply.
Fusing is safety critical and is a must.

Regards fusing, I’d suggest an ATO inline fuse holder with a cap and relays wise Durite do very good ones, with Diode 4 pin make and break would be ideal and follow online generic wiring diagram.
Then from there you can work out where you want to take your trigger from, I’d recommend from main beam live, but you can use a switch or both if you want but will be more involved with wiring it all up.

Hope that helps.

Supply input / output:
Relay pin 30, input fused @ 35A ATO 4mm2. (From fused battery live or other power source).
Relay pin 87, switched output 4mm2 (to spotlights).

Trigger, turning relay on and off:
Relay pin 85 negative ground
Relay pin 86 live incoming trigger, from main beam as an example.

Heatshrink terminals are probably best for waterproofing at the spotlights. Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧

4th Feb 2024 10:01pm

NFIN02

Member Since: 17 Feb 2022
Location: Londonderry
Posts: 95

Thanks for the info. I literally just bought a few metres of 2x28 flat twin core cable to hopefully start wiring up parallel. Hope I am on the right track?

5th Feb 2024 3:58pm

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