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Heater Box Wiring

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My Mazda has a heater box on the plenum intake rather than glow plugs, am I right in thinking this just needs to be on during cranking rather than before as with glow plugs?

It's fed from the live terminal on the stater motor but goes through a relay (photo). Shall I just connect the relay feed to the ignition starter terminal on the starter solenoid?




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