A relay is advisable, but you will need one for each beam. Fusing is also
advisable, again one for each filament, plus a higher rated fuse feeding the
two relays. Even though the wiring can handle the higher current long
lengths if it and 30-year-old switches will be dropping some voltage which
is lost from the lights and can melt the switches, using relays protects the
switches and gives maximum brightness. I did this on a modified car and the
owner said not only the difference in brightness was remarkable but also how
quickly they reached it. See
http://www.mgb-stuff.org.uk/wn_electricsframe.htm and click on 'Lighting'
and 'Uprated Headlamps ...' for a description and schematic. Mounting
relays and fuses just behind the radiator mounting panel means you can use a
short harness to pick up the wires from the switches and the headlights
without cutting into the loom.
PaulH.
----- Original Message -----
From: "Mark Lennan" <mlennan@crankyrobots.com>
To: <mgs@autox.team.net>
Sent: Thursday, November 06, 2003 11:37 PM
Subject: Headlight Question
> Stock output is (I believe) 55w Low Beam / 60w High Beam. If I go with
> an 80w/100w system, will I need a relay ?
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