Thread: 4BD1 Alternator

Originally Posted by EchiDna

no worries, I can get hitachi stuff easy enough - might have to hit the catalogues...

or try our old mate, Chop Hock Hong?

I have just got the hitachi LR170-401 70A that came on the 4BD1T from the US, $175 delivered.
I got it from "Starters Alternators (teamgri@yahoo.com)"
I havn't fitted it yet, can anybody tell me what wires go to where from the alt plug?
The 40A had a external alt so I will have to rewire it.

Originally Posted by Brian Hjelm

or try our old mate, Chop Hock Hong?

you got it Brian

those blokes have every conceivable Isuzu engine part for trucks in stock... 12volt, not so common, but maybe just maybe...

Originally Posted by Albert

I have just got the hitachi LR170-401 70A that came on the 4BD1T from the US, $175 delivered.
I got it from "Starters Alternators (teamgri@yahoo.com)"
I havn't fitted it yet, can anybody tell me what wires go to where from the alt plug?:(
The 40A had a external alt so I will have to rewire it.

Following is some information that might help. Note this is based on the USA version of the Isuzu truck so applicable for your alternator, but wiring circuits would be different in a Land Rover.

The alternator connections are very simple. The standard Isuzu alternator has an integral regulator which makes it even easier to wire up. Check Fig. 9 on page 6D-14 of the FSM for detailed wiring.

Basically, you have three wires going to a round connector on the back of the alternator plus a heavy black wire (B) going to the output stud also on the back of the alternator. This black wire should be heavy enough to handle the full alternator output (70 A) and goes directly to the (+) of the battery (might be a good idea to protect it with a fusible link or big fuse). The black wire (S) from the round connector also goes directly to the (+) of the battery. It serves to sense the actual voltage at the battery which the regulator uses to control the output voltage of the alternator. The white wire (IG) from the round connector goes to the ignition switch and should be hot only when the ignition switch is in the "run" position. This wire turns the charging system on and off. The white with blue stripe (L) is used to control the "Charge" indicator light and is optional. When the alternator is charging, the (L) wire is hot and turns on the "charge indicator relay". Since the indicator light is wired through the normally closed set of contacts on the relay, when the relay is turned on, the indicator light goes out. Hope that makes sense.

Having a problem with battery light staying on after shut down, sometimes whilst driving. Alternator seems to be ok, only 2 years old, 13.85v at idle at battery. Seems to be a loose connection, can hear a relay clicking when rock truck, light flickers. Bit hard to isolate where it is coming from. Would this be the charge lamp relay. If so where is it. Need to pull all the old A/C out at some stage, just a clutter on LHS. Not familiar with the dark arts so any ideas etc would be great.

Cheers
Paul

Just wired up a 70A as per Bush65's diagram.. it is now measuring 15.6V at idle - is that too much?

Originally Posted by flagg

Just wired up a 70A as per Bush65's diagram.. it is now measuring 15.6V at idle - is that too much?

yes sounds like the reg isn't regulating

JC

Could it be that I've wired it up incorrectly?

Instead of white and white + blue it was White + bluey green and white + bluey black. I may have them the wrong way around..