Alternator Wiring Termination Points?
Submitted: Friday, Jun 01, 2007 at 20:01
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Royston
I'm currently replacing the 2F petrol engine in my 1984 FJ40 LX with a 12HT turbodiesel, but I'm stuck at the alternator wiring stage. My FJ40 and HJ60/61 workshop manuals are no help as they don't cover this area. If you can help I'd really appreciate it.
PROBLEM - the original alternator used an external regulator, but the new engine has a late model 2H alternator with an internal regulator fitted. I need to know the termination points for the existing Nippondenso alternator harness connector (loom end) for the 2F (external reg) so I can identify and connect the correct wires to the 2H alternator connector plug (with internal reg).
The 2F harness connector has three BROWN, WHITE and YELLOW coloured wires feeding into it, whereas the 2H alternator connector (coming out of the alternator) has three BLUE, PINK and WHITE coloured wires going into it.
I need to know the termination points for both versions (ie; ignition, ground, B+, charge light etc) so I can utilise the 2H alternator with internal regulator. Even if I can just identify the 2H alternator wires at least I can run new cables. I think I've got the shutoff solenoid and glow plate wiring sussed OK.
There's got to be a techo out there who will take up the challenge?
Reply By: Philip A - Saturday, Jun 02, 2007 at 10:31
Saturday, Jun 02, 2007 at 10:31
I am not a tech but have changed over a few alternators.
The B+ will always be the thick wire, so that is easy.
There are two basic types of alternator, machine sensed with only two main wires and battery sensed with three wires.
So the third wire could be either a battery sensing wire or a wire to a tacho from the S terminal. So does the donor car 12HT have a tacho?
I have never seen an alternator with an earth wire. The alternator earths to the engine by its mounts.
To find which is the wire for the light in the plug going to the old external regulator, put a volt meter to earth on both the small wires with ign off. If it is a battery sensing wire, one will be live when ign off and on.
The ign light wire will only be active when ign on .
A tacho wire will have no power at any time. Does an 84 FJ40 have a tacho?
On the alternator, are there B+ , etc marked on the terminals that the wires connect to before the plug? I presume there is a tail on the connector as you have given wire colours,. The light should be also B. And the tacho S.
Hope this helps.
Regards Philip A
AnswerID:
244149
Reply By: Royston - Saturday, Jun 02, 2007 at 21:04
Saturday, Jun 02, 2007 at 21:04
Hi Philip.
Many thanks for the great feedback. In this case all three wires (blue, pink,white) out of the back of the 2H alternator are the same diameter. They come straight out with no identification marks that I can see, and then feed into the green connector on top of the alternator. I suppose that makes it a battery sensing alternator. There is also no tacho in the FJ40. I think I might have to disregard the original alternator wiring and run fresh wires - and that's OK. I've already put a charge indicator light in the dash and run the wire out to the alternator. All that remains is to identify which wire goes where into the alternator. Unfortunately my HJ60/61 manual doesn't give me the colour codes for this late 2H alternator.
Thanks
Royston
AnswerID:
244245