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sparrowdclxvi



Member Since: 31 Mar 2025
Location: Near Coventry
Posts: 7

United Kingdom 
2006 TD6 Start Issue

Hi all

I've got a very strange start problem on my 2006 TD6.

It started a few weeks ago. First cold day of the year and it sounded like a flat battery. Fired straight up with a jumper pack, so I replaced the battery.
With the new battery it fired up the first two times just fine.
However, that evening it wouldn't start again.
I assumed it was the starter motor so replaced that.
It was then fine for a few days, but now it's doing the same thing.

The ignition turns on fine, and everything works.
Turn the key to crank, and it's like the battery is flat. The starter motor just clicks a few times, then the dash turns off, and then the car resets.
Battery voltage drops as expected, so the starter is engaging and attempting to turn the engine.

However, if I put a jump pack on the posts it will start first time, every time.
If I remove the jump pack, turn it off and straight back on, it will not start. It's like the battery is flat, but it's not.
With the engine running the alternator is charging at about 14V.
Measured straight after turning it off, the battery voltage is 12.7V, and slowly dropping as expected.

I've measured the resistance from the battery to the two posts, and also measured resistance from the battery to the cylinder head. All the measurements are less than one ohm.

I'm stumped.

It had a new alternator last year due to charging issues, but that turned out to be a faulty ignition switch, so the ignition switch is also fairly new.

If anyone has any suggestions, please let me know.

Post #725818 8th Oct 2025 9:39am
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Weegie



Member Since: 09 Jun 2014
Location: East Sussex
Posts: 3274

Scotland 2008 Range Rover Vogue TDV8 Stornoway Grey

Check your earth straps. John
2008 Stornoway Grey 3.6 Tdv8 Vogue - SOLD
2005 TD6 Java Black Vogue - Written off!!
GAP iiD BT-Sold

Post #725821 8th Oct 2025 10:11am
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sparrowdclxvi



Member Since: 31 Mar 2025
Location: Near Coventry
Posts: 7

United Kingdom 

I forgot to say, I tried putting a jumper cable from the battery to the jumper post that it starts from with the jumper pack, and also from the battery to the cylinder head.
There is also no resistance from the battery to the engine blcok.

I'd ruled out the earth straps because of that, but I'll check them.

Any idea where they are?

Post #725823 8th Oct 2025 10:16am
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Weegie



Member Since: 09 Jun 2014
Location: East Sussex
Posts: 3274

Scotland 2008 Range Rover Vogue TDV8 Stornoway Grey

IIRC behind the front offside wheel. John
2008 Stornoway Grey 3.6 Tdv8 Vogue - SOLD
2005 TD6 Java Black Vogue - Written off!!
GAP iiD BT-Sold

Post #725824 8th Oct 2025 10:19am
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steve k



Member Since: 05 Apr 2024
Location: Berkshire
Posts: 63

United Kingdom 2003 Range Rover HSE Td6 Giverny Green
Re: 2006 TD6 Start Issue

[quote="sparrowdclxvi"]Hi all

"The ignition turns on fine, and everything works.
Turn the key to crank, and it's like the battery is flat. The starter motor just clicks a few times, then the dash turns off, and then the car resets.
Battery voltage drops as expected, so the starter is engaging and attempting to turn the engine.

However, if I put a jump pack on the posts it will start first time, every time"

I'm taking a guess here but a clicking starter motor just means the solenoid is at least trying to pre engage the gear so that current then flows to the motor unit. If there is stiction then the battery on its own struggles to fully move the gear far enough to then make the connection from the battery to the motor. The jumper pack adds extra capacity to keep the volts (current) sufficient to overcome the stiction/drag and achieve full movement of the solenoid?

If it were my car I would look at the solenoid connections on the starter motor off and then even remove the motor to assess the solenoid contacts, movement and general connections Current: 2003 TD6 HSE
2004 Vogue SE 4.4
Previous: 1993 Classic 3.9

Post #725896 9th Oct 2025 10:56am
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cass



Member Since: 12 Oct 2011
Location: northumberland
Posts: 793

United Kingdom 

I would fit a new Earth strap between the body and engine, it's a very easy way to prove the earth strap rather than finding, cleaning and refitting the originols.

Post #725907 9th Oct 2025 1:46pm
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nicedayforit



Member Since: 11 Jun 2011
Location: Beside the Solway
Posts: 3986

England 2004 Range Rover Vogue Td6 Giverny Green

Faulty ignition switch?

Post #725908 9th Oct 2025 1:49pm
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