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[Datsun 1200 encyclopedia]

Heater Wiring

Revision as of 18:10, 17 December 2012; view current revision
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Categories: Body Electrical System | Heating And Ventilation Systems | Wiring


The Heater fan is powered by the 15A 'W' fuse in the Fuse Box. The 'W' fuse is for Wiper/Washer/Heater.

Contents

Overview

fuse box heater circuit

Heater Resistor (inside view) 27015-H3100

Heater resistor (outside view)

Regular Wiring

When IG is on, heater fan motor is always "Hot". But the motor is not grounded until the heater switch is pulled out.

wiring

Fan switch Position No. 1 is OFF
Fan switch Position No. 2 is low-speed via Resistor
Fan switch Position No. 3 is high-speed bypassing Resistor

Heater wire loom with B wire and Y, YR, wires:

(the blue wire is not part of the heater circuit)

fan switch

1972 USA

For 1972 USA models, the heater and switch operated differently. Now the motor fan is directly connected to Ground via B wire, and HOT is switched via a new type switch.

Fan

  • B: ground
  •  ?: High speed
  •  ?: Low speed


Switch

  • LW: 12V from Fuse Box "W" (Wiper/Washer/Heater) via LR wire
  •  ?: High speed
  •  ?: Low speed

Illuminated

Some 1200s have illuminated dashboard controls, like the B210.

1973 USA

The wiring is opposite of other 1200s and also includes to lamps for illumination.

When key is at IGN, fan switch is "Hot". Position #1 is OFF. Position #2 connects to the fan resistor (in the fan enclosure) for low-speed mode. Position #3 connects directly to the motor for high-speed operation.

USA 1973 wiring

PROBLEM: The wiring diagram does not show how the fan Black wire is earthed.

Fan (Heater)

  • B: Ground?
  • n: Low speed
  • n: high speed