Defender 300 TDi electrickery

**clankilpatrick** · 16th February 2009, 01:37 PM

Originally Posted by p38arover

I
What happens to the temp gauge when you unplug the lead at the sender?

I think (not sure) that the gauge might read high if the sensor wire is grounded.

Ron, discnnected the wire from the sensor before i drove to work this morning and no change. It seems to be acting as a rev counter. Put the foot down and the needle goes up off the scale, ease back on the revs and the temp gauge returns back to normal operating temp.

Will try some of the earthing suggestions this evening.
cheers
Dave

**p38arover** · 16th February 2009, 02:18 PM

Blknight.aus has confirmed what I thought about the sensor/gauge.

I think I'd start looking at ground wires behind the dash after you've had a look at JustinC's earthing suggestions.

**clankilpatrick** · 16th February 2009, 09:33 PM

Good evening All,
many thanks for all of your input. Unfortunately I couldn't check the earthing suggestions this arvo as I got home late and the light had gone. Will have a look at lunctime tomorrow when the motor is a bit cooler. I did have a look at all of the gauges earth wires and they seem all intact. I have a car sparky mate who is going to put a dc voltage clamp on to check the alternator for me as well. I am sure the solution once found will be simple. it's just finding it that's the difficult bit.
Thanks again everyone, I will keep you updated
cheers
Dave

**clankilpatrick** · 16th February 2009, 09:35 PM

Originally Posted by Blknight.aus

most temp sensors go high on a short circut and low on open.

and AFAIK all the shed class rovers and the D1's do the same thing.

Black Night,
AFAIK ??? Mate don't know what that acronym stands for. And For All I Know???? possibly. And whats a shed class rover?
Got to keep up to date with these things I guess.
cheers
Dave

**rick130** · 17th February 2009, 07:29 AM

AFAIK = As far as I know
shed class = Series and 90/110/130

JamesH · 17th February 2009, 01:57 PM

I never had any trouble with the warning gauges but i did with temp gauge and fuel gauge to a lesser extent.

We always thought it was earthing but the sparky tried different combinations of straps here and there and the only solution that worked was to leave them all on. So apparently I have earthing points all over the shop.

Seems good now. The rising temp gauge on hot days with aircon on is not nearly as bad - and what I know now is that it's real and a recore will be due soon.

Earth everything everywhere seems to be the go for Defenders.

**rick130** · 17th February 2009, 05:10 PM

FWIW I fixed the earthing problem with my Temp gauge by fitting a VDO mechanical one

Problem solved.

Our Patrol has the same issue with the fuel gauge when the spotties (Super Oscars) are turned on, and I used a genuine Nissan loom for them

**clankilpatrick** · 17th February 2009, 09:47 PM

Originally Posted by rick130

AFAIK = As far as I know
shed class = Series and 90/110/130

Aha. Thanks for the eureka moment.
cheers
Dave

**clankilpatrick** · 19th February 2009, 10:12 PM

Good evening All,
firstly many thanks for all of your help. Slowly working my way through everything and it looks like that the alternator may be at fault after all. My question to all of you with much more knowledge about these things then I is
"What is a good alternator upgrade option" If I have to fork out for a new one I would rather pay for a Bosch or similar that apparently has more grunt and has replaceable brushes and regulator. Has anyone done this upgrade before and have a part number handy? I have found a few mentions in previous posts but only for the 200 tdi not the 300 and there was no detailed info.
once again,
many thanks in advance.
cheers
Dave

**justinc** · 19th February 2009, 10:21 PM

Originally Posted by clankilpatrick

Good evening All,
firstly many thanks for all of your help. Slowly working my way through everything and it looks like that the alternator may be at fault after all. My question to all of you with much more knowledge about these things then I is
"What is a good alternator upgrade option" If I have to fork out for a new one I would rather pay for a Bosch or similar that apparently has more grunt and has replaceable brushes and regulator. Has anyone done this upgrade before and have a part number handy? I have found a few mentions in previous posts but only for the 200 tdi not the 300 and there was no detailed info.
once again,
many thanks in advance.
cheers
Dave

Dave,
We use the 300Tdi disco 100mp alternator as a defender upgrade.
It is a straight bolt on, but may have to change pulleys if you have a pre 1996 model with the larger diameter alternator pulley, as the new ones usually have smaller ones and this makes the belt slack.(Or leave the pulley on, and fit the later belt, part number ERR5911, which is 1580mm long as opposed to 1595mm long for the early one.)
It hasn't been my experience that the brushes and regs are a problem with these Denso or Marelli alternators, plus don't forget that by the time the brushes etc are no good, you really should be looking at slip rings and bearings etc anyway...

JC

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