That "white brick thing" is a resistor. It is on the low circuit and does what the name says. It resists voltage for the low setting to be less hot. It gets quite hot so be careful where you mount it. I always gave them a few wraps of electrical tape to insulate it some.
Truth is these days I prefer Symtec brand without the resistor.
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-Mike
2009 Beta Evo 300 4T - 1982 Suzuki PE175
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