DISCO 300TDI REBUILT INTERMITTENT STARTING ... ANY IDEAS?

**awabbit6** · 16th January 2012, 08:18 AM

Originally Posted by Tank

I would have a new battery to starter cable made up, that will eliminate that, good earths are mandatory, Regards Frank

I'd get new earth straps made up too.
I had a charging problem on my 300Tdi Disco that turned out to be a faulty braided earth strap between the chassis and engine. The strap tested OK and both ends were clean, but under load the small resistance it had was enough to significantly reduce the current.

**Blknight.aus** · 16th January 2012, 08:30 AM

time for the multi meter, check the voltage drop across the following as the engine is cranking cold then do it hot.

battery +- starter solenoid
starter solenoid
the starter motor
bell housing to battery negative.

the one that changes is the problem.

**lux201** · 16th January 2012, 08:50 AM

Originally Posted by awabbit6

I'd get new earth straps made up too.
I had a charging problem on my 300Tdi Disco that turned out to be a faulty braided earth strap between the chassis and engine. The strap tested OK and both ends were clean, but under load the small resistance it had was enough to significantly reduce the current.

good point. although we have cleaned all the earths. we have not actually tried replacing this one.
i'll give it a shot as I already have a spare floating around.

also the bypass optioned mentioned earlier may help to diagnose this also.

**wrinklearthur** · 16th January 2012, 09:54 AM

Add to the already, Google page had this.

Starter motor going bad? - Land Rover Forums - Land Rover ...
landroverforums.com/forum/...ii.../starter-motor-going-bad-33274/
11 posts - 5 authors - 26 Aug 2010
Starter motors don't usually fail by spinning slowly. They spin slowly because of low current getting to them which eventually fries them. ...

That sentence says it all, if any cable or joint isn't passing the full amount of required amperage then the starter motor will get hot in it self and it's wirings will burn out.

Another thing to look for is the size of the cable, within reason it's bigger the better and too small a cable will have a high resistance when carrying cranking currents.

The contacts in the starter solenoid maybe tarnished also. finding the heated parts is one way of checking the problem.

Watts = Voltage x Current
Watts = (Current x 2) x Resistance (ohms)

if you follow that equation you can see that heat can be produced quickly if there is any resistance to the high current flow.
.

**Nomad9** · 16th January 2012, 09:36 PM

Hi Samuel,
Might be a wild stab in the dark but I've just suffered a very similar issue, if you still have the spider fitted behind the heater controls this might be worth a check, I found a knackered soldered joint. You can buy a bypass if you need one, just something else to consider. This being a random failure item I can't now understand why anyone with a Disco who goes into remote areas would still have one of these units installed as per original manufacture.
When I was asked if the one in my Disco was still installed until that point in time I had never come across the problem before. I've attached a thumbnail of the knackered soldered joint.

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