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Revision as of 07:42, 7 November 2012

The Hitachi LR series of internally-regulated Alternator was first fitted to North American B210 for the 1978 Model year. It weighs about 2-1/2 pounds more than a stock Datsun 1200 35A model and about 1 pound more than an externally regulated 50A Hitachi. The LR160 60 amp model is physically identical, and was first used around 1983.

1 Physical Specifications
2 Wiring
3 Parts
4 Others
- 4.1 Round I-L-S connector
- 4.2 Squared-Round S-L connector

Physical Specifications

The LR150/LR160 came on newer A-series engines.

LR160 - 60A, second from left
Engine-mounting side is 80 mm (~3-3/16") in between ears, same as stock Datsun 1200
- 10.5mm diameter mount holes
front flange (bolt ears) 13mm thick
Adjuster ear 175mm (~6-7/8") across. The stock 1200 unit is smaller at 156mm (~6-1/8") from the mount ear.
- So you may need a late A12 adjuster and fan belt
- threaded for M8x1.25 bolt
About 129mm diameter.
Fan belt center: 29mm from front bolt face
Pulley diameter: 69mm

Wiring

B310

The Hitachi LR150 (50A) was used in 1978-1982 B310 North America version. Here is the factory wiring diagram portion:

[Direct scan of 1980 B310 wiring diagram for North America. It is a color diagram.

Notice the I.C Alternator T-connector head is connected directly to A/BAT terminal (unswitched battery voltage).

B - Black wire. Earth/Ground
W - thick White wire. BAT+ via Fusible Link
W - thin White wire in T-connector head. BAT+
WR - White/Red in T-connector stem. To dash 'CHG' Lamp

Notice that the I.C Alternator T-connector head is connected to A/BAT terminal (unswitched battery voltage). The splice occurs in the wiring harness.

L - Lamp (stem of T) -> To dash lamp
S - Sense (head of T) -> to BAT+

Fitting To Early 1200

If you install an LR alternator with internal-regulator on a 1200:

disconnect the voltage regulator
On the B110 regulator harness that goes down to the engine, connect WB wire of connector to WR wire of connector:
WR <--> WB
wiring jumper
Logically, you are connecting the "L" (Lamp) of new alternator to "L" (Lamp) of the wiring harness which is connected to the IGN switch. Be sure to use the original Datsun 1200 wiring harnesses as the "L" wire color WR is a switched source in the harness. Only one jumper wire is needed.

Some prefer two wires, which works on a 1200, 1200 with auto-choke, and with other Datsuns:

Jump W to Y wires
Jump WR to WB wires

wiring diagram:

Store-bought version ($30) of jumper wire

You can buy one mail-order from Bprojects. Endo will take care of you, send an email to Bprojects.

ic%20harness.gif
Price: 5,250yen (about $52 USD)

Wiring Explanation

CAUTION: if you jump W to B it will spark, begin to melt and then blow the Fusible Link. Possibly too with other wire combos too depending on if the key is on or off. In any case it should not cause a fire if the Fuses and Fusible Link are all in place. Older Datsun 510 & 521 may not use a Fusible Link, so be sure to connect the right wires.

Voltage Regulator connector
* White: battery feed
* Yellow: Nuetral (of original FN alternator)
* White/Red: Lamp (dash CHG or IGN light)
* White/Black: Field (of original FN alternator)

In the conversion:

Yellow goes to S terminal of LS alternator, so jumper connects Sense to battery
WB goes to L terminal of LS alternator, so jumper connects Lamp to dash lamp

You can double-check all this with a voltmeter.

The original 35A alternator should have FN terminals

The Internally Regulated alternator should have LS terminals (but same T-connector as FN types)

Automatic Choke

NOTE: If your Datsun was factory-equipped with Automatic Choke, a second jumper is needed. See above.

Alternate method of wiring the choke: With LR alternator: On the carburetor, unplug the electric choke. Make a new jumper wire from the choke to the ballast resistor (12V side). The downside of this is the choke starts warming as soon as KEY is ON, whether the engine starts or not. If you have trouble starting the engine, in cold weather you may never get it started, because the choke begins to open.

Original Wiring

The wiring harness for Datsun 1200 auto choke with LT-series alternator, for example, the 1973 1200 USA, the choke relay is connected to Ground. See Alternator_Wiring#Automatic_Choke_Relay
1200 relay, normally open. Alternator output will close the relay, activating the choke heater.

The wiring harness for B310 with LR-series alternator, the choke relay is connected to IGN
B310 relay - normally closed. IGN switch will activate the relay, deactivating choke heater. Then alternator output will de-activate the relay, causing the choke heater to power up.

The Choke Relay is wired oppositely different on LT-series and LR-series applications. However, since both are triggered by the Lamp/Nuetral wire, either alternator will work with either wiring harness/relay combination (old harness/old relay OR new harness/new relay).

Troubleshooting

1. Check the Voltage at the alternator. Between the BAT terminal and the E terminal (earth/ground) there should be the same V as at the battery. If not, you got a wiring problem.

2. The S terminal should be 12V hot when key is turned to IGN

NOTE: on the B310 with this, S is hot all the time
either way will work

3. The L terminal (Lamp) should be:

0V when key is turned OFF
12V (more or less) when key is turnd ON

Because the L terminal is the exciter, if your CHG lamp is burned out, the Hitachi LR won't charge.

Engine Won't Shut Off

If wired incorrectly, the engine will keep running when you turn the key off.

Regulator Still Plugged In

The FN wiring is different from LS wiring. So if you leave the external regulator still plugged in, the wires are incorrect.

It won't cause overcharging, since the LR is internally regulated.

L-S
Lamp: stem of Tee
Sense: head of Tee

F-N
Field: stem of Tee
Nuetral: head of Tee

If the external regulator is left plugged in:

the Nuetral line of regulator will be connected to the Sense terminal
the Field output of regulator will be connected to the Lamp input/output terminal

Parts

B122 Hitachi LR135 (35A) : See LR135

B210 1978, B310 50 amp Hitachi LR150

23100-H7703 B310 0381-
- replaces 23100-H7702 B310 0580-0281
- replaces 23100-H7701 B310 0978-0480
- replaces 23100-H7700 B210 0877-, B310 -0878
BOSCH AL238X, AL241X $71.99 at RockAuto.com
BBB PRECISON 14255
REMY 14185
BECK/ARNLEY 1860266
ACDELCO 321-1265 {#10463708}

Diode assembly

Nissan 23230-W7101 or 23230-P2501 DIODE ASSEMBLY
AIRTEX 2D3071

LR160 60 Amp

23100-W5807 Hitachi LR160, replaces 23100-W5805, 23100-W5806
BOSCH AL241X
BBB PRECISON 14587
ACDELCO 3341661 {60 AMP #19134654}
REMY 14301

Sources

LR150

Datsun 200SX (1978 - 1979)
Datsun B210 1978
Datsun 210 (1979 - 1982)
Datsun 310 (1979 - 1982)
Datsun 510 (1978 - 1981)
Datsun 720 PICKUP (1981 - 1985)

LR160

Datsun 200SX (1978 - 1983)
Datsun 310 (1979 - 1981)
Datsun 310 DELUXE 1982
Datsun 310 GX (1980 - 1982)
Datsun 510 (1978 - 1981)
Datsun 720 PICKUP (1981 - 1985)
NISSAN PULSAR 1983
NISSAN PULSAR NX (1983 - 1986)
NISSAN PULSAR NX TURBO 1983

Brushes

Brush Assembly LR150 (B210 from 0877)

23135-P2500 BRUSH ASSY LR150
23133-P2501 BRUSH REGULATOR ASSY LR150 replaces 23133-P2500
- Includes IC regulator
STANDARD MOTOR PRODUCTS Part # VR592

Regulator

B210 1978 Internal IC Regulator (requires soldering)

23215-P2501 IC REGULATOR ASSY LR150 0877- replaces 23215-P2500
STANDARD MOTOR PRODUCTS Part # VR162

Others

Round I-L-S connector

may fit stock adjuster bracket (156mm mounting)
Use with 4mm spacer (extra washers) on engine rear mount bolt

Hitachi LR160-723

1990-1993 Nissan Pickup

Hitachi LR150-704

1989-1992 Isuzu Amigo
1988-1992 Isuzu Pickup
1991-1992 Isuzu Rodeo
1987-1991 Isuzu Trooper 2.3

Hitachi LR150-718

NOTE: 175mm mounting
1989-1992 Isuzu Amigo
1988-1992 Isuzu Pickup
1991-1992 Isuzu Rodeo

Squared-Round S-L connector

Hitachi LR170-734B/739B/745 (about 1/2 kilo heaver that LR160)

NOTE: 175mm mounting
NOTE: 8.5 mm (smaller) mounting holes
NOTE: Large 77m pulley
1990-1995 Nissan Pathfinder
1990-1995 Nissan Pickup

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Hitachi LR Alternator