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Main : Mechanical Ignition Switch Comparison

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Ignition Switch Comparison
Ignition Switch ComparisonPopular
SubmitterddgonzalMore Photos from ddgonzal   Last Update2009/8/2 9:28    Tell a friendTell a friend
Hits14972  Comments4    10.000010.00 (1 vote)
B110 Small vs B110 Large

* I think the B110 switch here is a 1971 USA model. It has four-connectors and wont fit a five-connector harness due to the molding.

* The 1972-1973 USA switch has five connectors

The B110 small and large are wired differently! So don't even try to swap them them.

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Poster Thread
ddgonzal
Posted: 2004/10/17 4:09  Updated: 2009/8/2 9:27
Moderator
Joined: 2001/5/3
From: 48 North
Posts: 31575
 Re: Ignition Switch Comparison
1972 has a larger-diameter switch with two mounting lugs. 1971 is smaller with one mounting lug.

The 1971 'Small' switch has four spade terminals. The 1972 and newer 'Large' adds the "Accessory" position and so has five spade terminals.

B110 North American Wiring
W - B
BW - IG
BW - ACC*
BY - S
BR - R
*1972, 1973 only

B210 North American Wiring
W - B
BW - IG
LW - ACC
YB - S
BR - R


Switch internal connections:
Off - no connections
Accessory - Battery (hot) to ACC
Run - Battery (hot) to ACC + IG
Start - Battery (hot) to IG + Resistor + Start
*Starting with 1974 automatic models and all newer, ACC is also hot while in the Start position.

LB110 wiring follows:

IG - Ignition. This connects to two things:
1. Directly to Ballast Resistor (non-coil side). If equipped with optional factory tachometer, this circuit goes through tachometer
2. To IG circuit of fuse box

S - Start circuit. This is connected only to the:
1. Solenoid on the starter

B - Battery (always hot)
1. Battery + terminal, through the fusible link
2. Fuse box "B" side
3. Alternator "A" large output wire
4. Voltage regulator "A" terminal

R - Resistor. Connects directly to:
1. Coil + terminal
2. Ballast resistor (coil side)

ACC - Accessory circuit. Connects to:
1. Radio (through inline fuse)
.. 1971 Radios connect to fuse box L wire (always hot)
2. Optional heated rear window glass (1972-North America, 1973-Canada only)
Note that this circuit does NOT go to the fuse box, as does Bat and IG.

Wire color codes
B - Black
W - White
R - Red
Y - Yellow
G - Green
L - Blue
BW - Black wire with White stripe

Poster Thread
A14force
Posted: 2004/10/18 0:18  Updated: 2004/10/18 0:18
No life (a.k.a. DattoMaster)
Joined: 2003/12/3
From: Christchurch NZ
Posts: 3706
 Re: Ignition Switch Comparison
I have used a 310 ignition unit complete on my 1200. The 310 was an "79 or "80 model. I can't remember what year the coupe was I took the 1200 loom out of.

Poster Thread
ddgonzal
Posted: 2009/8/2 7:23  Updated: 2009/8/2 9:19
Moderator
Joined: 2001/5/3
From: 48 North
Posts: 31575
 Re: Ignition Switch Comparison
Yes I found the Large B110 switch interchanges with both Datsun 210 (B310) and Datsun 310 (N10).