Random wire

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tony81

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Vancouver Island BC
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Tony
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78 C25 camper special
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Heavy duty 350
Can anybody tell me what this blue wire coming up behind my motor in between the firewall with a round rubber plug on it before it’s only one wire
 

PrairieDrifter

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Mason
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84,79,77,76,70,48
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Suburban k10, bonanza k10, k30, k20, c10, gmc 1/2ton
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350, 350, 350, 350, 350, 350
Yep it's one blue wire. One end plugs into a thingymajig. Then it plugs into a thing on the other end.

You're working on a 1942 ford right?
 

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