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Current revision

The Datsun 1200 ignition switch is also known as an "Ignition Starter Switch". For STD models, it is integrated into the Key lock switch. For Super DX and higher grades, it bolts to the back of the key cylinder.

Usage

1972 USA Owners manual (Page 11 ... ):

Instruments and Controls

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Variations

5-position switch (with ACC) vs 4-position switch:
Album 22011

3-position JDM "Garage" switch vs OPTION 5-position switch:
Album 22007

Portugal market:
Album 22008

Interruptor de ignićāo [Ignition switch]
Desligado [OFF]
Ligado    [ON]
Arranque  [START]

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Standard Type

STD 1200s and DX built for Japan market have a dash-mounted switch instead of steering column-mounted (Steering Lock). The keylock & ignition switch are integrated with only three or four spade terminals on the switch.

The ignition switch is mounted via bracket on the dash.
Album 24036

The key lock cylinder and ignition switch are integrated in one unit.
Album 18267

NOTE: Early units had a 3-connector ignition switch. Later units had four connectors.

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Part Numbers

SWITCH-IGNITION for NON-STEERING LOCK
25150-H1000 SWITCH COMP.-ignition & starter (up to '71-3)
25150-H1010 SWITCH COMP.-ignition & starter (from '73-8)
25150-H2500 SWITCH COMP.-ignition PB110 DX
#25150-G1001 SWITCH COMP.-ignition & starter (up to '78-3)

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Wiring

4-terminal type
BW IGN
BR COIL (for start position)
BY STARTER
W  POWER (12V in from Fusible Link)

3-terminal type
POWER
START
ON

4-terminal Wiring
Album 25883

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3-terminal

25150-H1000 SWITCH COMP.-ignition & starter (up to '71-3)
25150-H1010 SWITCH COMP.-ignition & starter (from '73-8) [alternate manufacturer]

Niles OEM for Datsun
Album 25563 Album 25564 Album 25565 Album 25566

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25150-G1001

4-terminal keyed OFF - ON - START
Album 21998

25150-G1001 SWITCH COMPLETE-ignition & starter (up to 1978-3)

Post 498793 Post 498793 Post 498793

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B210

B210 Van and B210U (export B210) by NILES 188139-8000 イグニツションSWサニー VB210, B210U, KB210U

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Steering Lock Type

A locking steering column was a Datsun 1200 OPTION for early STD and DX models. It was standard equipment for USA 1200s, JDM GL and GX, and newer JDM 1200 pickups

The actual electrical Ignition Switch for this type is removable, and bolts to the back of the Steering Lock. In other words, the Ignition Switch is not strictly part of the Lock Cylinder, but connects to it. A rectangular wire connector from the dash harness attaches to the ignition switch.
Album 20003
Fitment of ignition switch into ASSY-LOCK STEERING

Late (large) vs 1970/1971 (small)
Post 429867 Post 429867

There are two types of LARGE units: single bolt tab & two-bolt tab

There are two types of SMALL units: 4-terminal switch & 5-terminal switch. The latter was not used by Datsun 1200

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Switch Part Numbers

ELECTRICAL IGNITION SWITCH ASSEMBLY
#48750-H1900 for STEERING LOCK -7803
#48750-E7705 5 POINT 0471- USA 0 48750-H1900
#48750-E4700 for STEERING LOCK 7804- [Small type]

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Interchange

Later 1200 switches interchange with Datsun B310 and several other Datsun models, but not B210.

Ignition Switch Comparison
Album 4973
* B110 Small size ~28mm diameter
* B110 Large size ~34mm diameter

TIP: On the back of the switch, each contact is marked ('S', 'IG', etc. molded into the plastic). Double-check before replacing to ensure they are the same.

The larger-diameter switch has two mounting lugs and is used with Keylocks that have an ACC position. 1972 and 1973 1200s use this, all the way up to 1982 B310.
Album 20004 Album 20002

The small-diameter switch has one bolting lug. And has only four spade terminals without ACC position. It was used on Japan 1200s (USA only for 1971).

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B210

B210 ignition switch does not interchange with B110 per the parts catalogs.

Top: early B110. Bottom: B210
Album 20007
It looks like it would plug into the Small B110 harness, but is wired differently. Beware!

AIRTEX 1S6174
ACDelco E1478A Rockauto
- Datsun
  - 1974-1978 B210
  - 1973-1976 610
  - 1975-1977 710
  - 1976-1978 F10
- Subaru
  - 1985-1989 DL, GL
  - 1985-1987 GL-10
  - 1987 Standard

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48750-H1900

48750-H1900ᴳ ELECTRICAL IGNITION SWITCH ASSEMBLY for STEERING LOCK -7803

* USA early to 1971.03
* JDM B110/B120 to 1978.03
Small diameter
Four spade connectors
One screw lug

Type H19: B110U (USA), B110N (Canada)

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48750-E7705

48750-E7705ᴳ late 1971, 1972-1973 USA

48750-E7705 5 POINT 0471- USA 
no interchange with #48750-H1900
Large diameter
Five spade terminals
Two screw lugs

Aftermarket
* Standard Motor Products (SMP) US-120ᴳ
* ACDelco E1406ᴳ
* Beck/Arnley 2011174/201-1174 Rockauto $20 (2025)
  OEM Interchange Numbers: Nissan 48750-E7005, 48750-E7705, Subaru 783131010ᴳ
* Airtex 1S6172
* BWD CS154
* CARQUEST Premium By WELLS 53-27620
* Duralast LS518
* NAPA Echlin KS6673
* General Motors 19021152
* Import Direct 18-0325
* Kem UL15-10
* Subaru 783131010

Beck/Arnley 2011174 Fits:
Subaru (USA models listed)
* 1982-1987 Brat 
* 1986-1987 GL 
* 1980-1984 DL 
* 1980 GLF 
* 1980 GL 
* 1980-1987 Standard 
Datsun
* 1968-1973 510
* 1970-1978 240Z, 260Z, 280Z
* 1979-1983 280ZX
* 1972-1973 1200 (B110)
* 1979-1982 210 (B310)
* 1978-1981 510 (A10)
* 1977-1981 810 (Bluebird)
* 1982-1983 Maxima (910 Bluebird)
* 1979-1982 310 (N10)
* 1977-1983 200SX (S10)

ACDelco E1406 ignition switch also fits:
* Same as Beck/Arnley 2011174 except B110, except Subaru
* 1979 Datsun 620
* 1980-1982 Datsun 720 USA for steering lock

[edit]

48750-E4700

48750-E4700ᴳ for STEERING LOCK 7804-

Small diameter
five spade terminals
One screw lug
Lock position inline with screw lug
Supercedes 48750-E4700/48750-E4701
* Datsun B120 Sunny Truck
* Datsun 510
* Datsun #311 Roadster
* Datsun 720 USA

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SMP 116

SMP US 116 Sᴳ for Subaru 1978-1981. Does not fit Datsun 1200 (wiring differs), though looks very similar and uses the same key)
Post 429867

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Wiring

Common Problems

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Start Problems

Ever had the "sometime it doesn't operate the Starter until I turn the key back and forth a few times" problem?

This occurs because the relatively high current loads of the starter solenoid tend to burn the ignition switch Start contacts after some years. This only gets worse. You might think you could prevent this problem by using a relay. The S wire could go to to a relay, and the relay could go from the Main Fuse to the starter. The problem is if the relay sticks, you won't be able to turn it off with the key. To prevent this, you could use two relays, with the main power fed through a relay connected to the IG terminal of the switch. Then if the starter relay sticks, you could turn key to ACC or OFF to stop it.

It is easiest just to replace the switch.

Another common issue is when the key is turned to the 'start' position, and it does not spring back to the 'on' position when the key is released. The switch needs to be replaced in this situation also.

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Starts but does not Run

"It will crank and catch fire when key turned to Start, but dies as soon as I release the key to the ON position"

The coil is getting Start current, but not Run current. Causes may include:

Ballast Resistor is burned open. It is only used to Run, but not to Start
Wiring is loose or bad on ballast resistor
Ignition Switch is bad or incorrect part. START position works, but ON does not

Album 23268

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Testing

You can test the ignition switch with an ohmmter, which is the most direct way. Alternatively, a test light will work, but needs a voltage feed.

Pull the wiring connector off the back of the ignition switch
Unscrew the ignition switch from bracket (early/STD 1200s) or rear of the key lock cylinder (Steering Lock 1200s)
Check ohms between S and B terminals. Should be infinite ohms (no reading)

Turn switch with screwdriver to Start and hold it there. Ohms between S and B should be 0 ohms. If it does not test out correctly, get another ignition switch.

Album 4973

Image Search: イグニションキーᴵ

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Ignition Switch

Current revision

Contents

Usage

Variations

Standard Type

Part Numbers

Wiring

3-terminal

25150-G1001

B210

Steering Lock Type

Switch Part Numbers

Interchange

B210

48750-H1900

48750-E7705

48750-E4700

SMP 116

Wiring

Common Problems

Start Problems

Starts but does not Run

Testing