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10-20-2009, 03:22 AM
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cre
T
oyota
R
acing
D
evelopment
Join Date: Apr 2007
Posts: 5,038
Yes, you do need a relay. Supply the inverter directly from the alternator via a relay and trigger the relay with the old headlight line. Don't forget to install an inline fuse (I would think a 40A would do).
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