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In addition to the main fuse wire (Fusible Link) in the engine compartment, there is a main fuse box under the dashboard.

1 Overview
2 Wiring
- 2.1 Battery Feed
- 2.2 Ignition Feed
3 Fusible Link
4 Cleaning
5 Part Numbers
6 History
7 Aftermarket Fuse Box

Overview

USA 1972 Owners manual (see pages 35 for fuse information):

If a fuse needs to be replaced, refer to the specifications listed on the fuse box cover.

Fuses
B110 uses the standard cylindrical fuses used by all cars until around 1980. The numbers are:

Nissan 25461-89901/08941-11000 FUSE (10A)
Nissan 25415-89900/08941-11500 FUSE (15A)

AGC Type (All Glass, C length 1.25 inch)
1/4" diameter (approximately 6mm diameter x 30mm long)
SFE20 type is the same.

IG: Ignition Switch Circuit (only HOT when key is in IGN position)

'W' 15 AMP Wiper, Washer, Heater
'M' 10 AMP Meter, Reverse Lights, Alternator Regulator

Battery/Alternator Circuit (always HOT)

'L' 15 AMP Head Lamp
'PT' 10 AMP Park lights, Tail lights
'C' 15 AMP Radio, Clock, Cigarette lighter, Room lamp
'H' 15 AMP Horn, Stop lights, Hazard lights

There are also two empty holes in the fuse box to hold two spare fuses.

Location

It is located under the dash above the driver's right knee. It is bolted to a bracket on the bottom of the dash frame:

LHD

Late Model

Variations

#1 (2nd source - up to '71-Mar)
___ 10A (w/o headlamp fuse)
15A 15A
10A 15A

#2
15A 10A (with headlamp fuse)
15A 15A
10A 15A

#3
20A 10A (620 type: headlamp changed to 20A)
15A 15A
10A 15A

Late Ute

Utes from 1982 feature rectangular fuses. Also eliminates the plug-in connectors on the back of the fuse box, which was a problem spot in older 1200s.

8110-8910 Variation 1
8910-     Variation 2

The "ENGINE CONTROL" fuse was also used by B310 and other 1980s Datsuns. It is the main Ignition-switched feed for the engine harness. Feeds the vacuum cut, fuel cut, and auto-choke relay.

1982-1989

8110-8910 Variation 1

IGNITION イグニッション
 10A COIL イグニッション コイル
 10A ENGINE CONTROL インジン コントロール
 10A METER REVERSE メーター バックランプ
 ---
ACCESSORY アクセサリー
 15A RADIO HEATER WIPER ラジオ ヒーター ウイパー
 15A LIGHTER シガ ライター
BATTERY バッテリー
 10A FLASHER　フラッシャー
 10A TAILLAMP ROOMLAMP テールランプ ルームランプ
 15A HORN STOPLAMP ホーン ストップランプ
 15A HEADLAMP ヘッドランプ
指定した容量以外ノヒューズは入れないで下さい。
Please do not use other than specific capacity fuse.

24311-G1900

1990-1994

Variation 2

Wiring

The instrument panel wiring harness has individual connectors to the Fuse Box:

Battery Feed

BATTERY FEED powers L, PT, C and H fuses

15A L Fuse:
* Light Switch (head lamp circuit)

10A PT Fuse:
* Light Switch (park & tail light circuits)

15A C Fuse:
* Cigarette Lighter
* Radio
* Clock
* Room Lamp

15A H Fuse:
* Horn
* Stop Lamps (brake lights)
* Flashers (turn signals)

Ignition Feed

IGNITION FEED powers M and W fuses

10A M Fuse: 
* Voltage Regulator
* Instrument Panel Gauge Regulator
* Brake Lamp
* Oil Pressure Lamp
* Charge Lamp
* Reverse Lamp
* Hazards

15A W Fuse:
* Wiper
* Washer
* Heater

Fusible Link

The Fusible Link ("Main Fuse") connects to the POS battery terminal about six inches from the battery. The fusible link is a special length of wiring that will melt if its rating is exceeded and is there to stop the electrics if the car is drawing too much power, like an open short circuit.

See main article: Fusible Link

Cleaning

If your fuse box gets HOT or starts melting (but the fuse does not blow), then CLEAN the fuse box. Soak it in vinegar for 10 minutes.

Or if you are getting electrical equipment not working, clean the fuse box.

Why? Dirty connections cause undue resistance, eventually leaking to this:

The reason that fuse lead is getting hot is because of resistance. This is pretty common with old-styled glass fuse boxes. You get resistance at either the fuse itself, or the connection between the fuse and the terminal - along with whatever other resistance is present in the wiring. The corrosion is at the fuse box connections, which is why it gets hot, and why it melts.

Disconnect the battery
Remove all the wires from the fuse box (take a photo first, or write them down carefully which is which)
Take the fuse Box in the house and soak it. Fill a small bowl with distilled white vinegar from the grocery store. Soak for 10 minutes.
Rinse with water with a little Arm & Hammer mixed in to nuetralize the acid from the vinegar. Then rinse with plain water
Let dry thoroughly/overnight
Put a little dielectric grease (a LITTLE not a LOT) on each copper terminal (front and back of fuse box) to keep moisture corrosion minimal

Part Numbers

B110: 6-FUSE BOX
25410-H1000 BLOCK-FUSE
B5415-H1000 COVER-FUSE BLOCK
 
25410-H1100 ASS'Y-BLOCK, fuse (2 系統)(up to '71-Mar)
B5415-H1100 COVER-fuse block (2 系統)(up to '71-Mar)
  
25410-B5102 BLOCK-FUSE
08510-51212 SCREW (2)
08915-13510 WASHER-SPRING (2)
25461-89901/08941-11000 FUSE (10A)
25415-89900/08941-11500 FUSE (15A)

Datsun 620 USA FUSE BOX
25410-H1000 -0746
25410-B8000 0974-0476
25410-B8001 0576-0776
25410-B8002 0876-0877
25410-B8060 0878-
 
* Original Manufacturer: NILES brand No. FB 206N
* Fits B110 and 620

B210
* 25410-H6200 ASSY-BLOCK FUSE -0974
** 25411-H6200 COVER-FUSE BLOCK -0974
* 25410-H7200 ASSY-BLOCK FUSE (YAZAKI) 1074-
** 25411-H7200 COVER-FUSE BLOCK (YAZAKI) 1074-
* 25410-H7205 ASSY-BLOCK FUSE (SUMITOMO) 0476-
** 25411-H7205 COVER-FUSE BLOCK (SUMITOMO) 0476-

B310: 8-FUSE BOX
08941-12000 20A FUSE
* 25410-W5801 USA BLOCK ASSY-FUSE
** 25411-W5801 USA COVER-FUSE BLOCK
* 25410-H9400 JDM BLOCK ASSY-FUSE
** 24511-H9400 JDM COVER-FUSE BLOCK
* 25410-W5001 JDM BLOCK ASSY-FUSE YAZAKI
** 24511-W5001 JDM COVER-FUSE BLOCK YAZAKI

B120: 6-FUSE BOX
* 25410-G1600 BLOCK ASSY-FUSE -7709
* 25410-G1601 BLOCK ASSY-FUSE 7710-7801
* 25410-G1660 BLOCK ASSY-FUSE 7802-8109

B120: 10-FUSE BOX w/Rectangular fuses
* 24310-G1900 BLOCK ASSY-FUSE 8110-8910
** 24311-G1900 COVER-FUSE BLOCK 8110-8910
  
  
* 24310-95W00 BLOCK ASSY-FUSE 8910-
** 24311-95W00 COVER-FUSE BLOCK 8910-