Defender 90 300tdi alternator problem

DEFENDER90-DAZ said:

Yes the power for the dash is via the thin white wire which is also connected to the back of the alternator with a female spade connector
The thin brown/yellow is on a post and the thick brown is on another post

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are you joking?

erm no.................... thats how my alternator is wired up and its the same as the one i took off my old engine - both 300tdi defenders

Haynes manual 5.4 (engine electrical systems) section 6 - 300tdi engines 6.14 disconnect the wiring from the back of the alternator (see illustration) 3 wires arrowed

well some ones done something odd as it shouldnt be d+ ignition battery light is the exciter wire that and b+ large wire to starter/battery is all it should have unless you fit the w terminal to a rev counter ,but without nothing ,car and dash are fed by a brown wire to ignition switch where a white wire takes off all ignition feed and white /orange takes off auxillary feed

Odd?? Thats how it is in the Haynes bible James??

DEFENDER90-DAZ said:

Haynes manual 5.4 (engine electrical systems) section 6 - 300tdi engines 6.14 disconnect the wiring from the back of the alternator (see illustration) 3 wires arrowed

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i dont have haynes ,but it is as i say

DEFENDER90-DAZ said:

Odd?? Thats how it is in the Haynes bible James??

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its not odd youve made a mistake somehow

jamesmartin said:

its not odd youve made a mistake somehow

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You have got me double checking now!!

But yep its 2 wires on different posts and a wire with female spade connector - is it wired up wrong???

b+ big brown battery feed d+ ignition light nothing else unless a rev counters fitted then to w

Strange.................. my rev counter is on the same post as the brown/yellow wire and it does work so what should i do about the white wire with the female connector then??

check the terminals ie b+ d+ and w they are marked and readable if std 300tdi alt

Your both right

James is describing wiring for 1991 - 94

Daz is describing wiring for models 1986 - 91


erm I think

Bromsgrove Defender said:

Your both right

James is descibing wiring for 1991 - 94

Daz is describing wiring for models 1986 - 91


erm I think

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nearly im describing from series 3 up although series and 2.5s had 2 wires to b+ but the principle is the same

jamesmartin said:

nearly im describing from series 3 up although series and 2.5s had 2 wires to b+ but the principle is the same

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It is

I've looked into this a bit further and some alternators have a "S" terminal which is for battery sensing which would account for the 12v feed via the whire wire with female terminal

not on a std defender

DEFENDER90-DAZ said:

Haynes manual 5.4 (engine electrical systems) section 6 - 300tdi engines 6.14 disconnect the wiring from the back of the alternator (see illustration) 3 wires arrowed

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Pic of pic

DEFENDER90-DAZ said:

Pic of pic

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Excellent pic now look at wiring diagrams from 1984 - 1994 and you'll see what James is on about

So why the 3 connections in the pic then?
Is it because the wiring diagram incorporates the diode and resistor as in the wiring diagram???

Now i am confused, mine has got big brown wire, brown and yellow wire both on bolted terminals, then a white wire with a female terminal, all were conected that way, havent removed any to get them wrong and all worked fine before i used the alternator to turn engine over, hasnt got a rev counter either, has got raptor dash tho with a volt/charging gauge.