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wilbilt · 08-21-2011, 01:36 AM

I haven't added relays to my truck yet, but I have done this upgrade to other vehicles in the past. The most impressive improvement was my '73 FJ55 Land Cruiser. Due to the old wiring, switch, etc., the voltage at the headlights with the engine running was about 8.5V.
After installing the relays fed from the alternator, the voltage under load was 13.7 at the lights. HUGE difference in nighttime visibility.

08-21-2011, 01:36 AM	#12
wilbilt Registered User Join Date: Aug 2011 Location: Northern California Posts: 189	Re: Headlights and Relays I haven't added relays to my truck yet, but I have done this upgrade to other vehicles in the past. The most impressive improvement was my '73 FJ55 Land Cruiser. Due to the old wiring, switch, etc., the voltage at the headlights with the engine running was about 8.5V. After installing the relays fed from the alternator, the voltage under load was 13.7 at the lights. HUGE difference in nighttime visibility. __________________ 1971 GMC C2500 Custom Camper - Second Owner. 350/TH350, Dana 60 Rear.