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Discussion Starter #1
Hi all

Got a defender 110 2003 reg

Got an intermittent fault with Parking Brake.
If the physical parking brake is mounted to the body all is fine and all starts and works.
How ever if the parking brake is disconnected while engine running the engine stops. My logic leads me to believe that parking brake is being used as ground. Is that suppose to be like that?

Only came up because when driving and if it bounces a bit it can stop the engine whilst driving.

I tried to give ground directly from battery to engine still same issue

Any suggestions?
 

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Not familiar with the electrics on such a new truck but sounds like there may be a safety switch linked to the parking brake that is shorting-out.
 

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Take a pair of jumper cables out.
Remove the LH seat base and battery cover.
Connect BOTH cables from the negative (-) battery post to the engine away from the fan belts.
Disconnect the handbrake cable.
Start the engine.
Disconnect the battery cables.
If the engine stops and/or fails to start again you just verified that the engine is not properly grounded.
This needs to be fixed ASAP because as the starter "looks for" a ground, it can potentially draw through any ground like the engine coolant, radiator mounting points, driveshaft u-joints, differential gears, and so on,
This can actually do some welding and start fires.
This will convince you that your predetermined misconception that the engine is properly grounded if false.
Or if you're willing to give up the misconception that the engine is properly grounded, leave everything the way it is and disconnect all the ground straps, clean them, and verify that the engine is grounded by reporting that the problem has gone away. Serrated washers go a long way to improve grounding connections.
There should be a ground strap to the chassis and another ground strap from the chassis to the engine or transmission, or transfercase.
 

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Oh forgot to mention.
If you run the jumper-cable test and it has no effect, that you do NOT have a predetermined misconception that the engine is properly grounded and the fault lies elsewhere.
In that case you can ignore all the rest of post 3.
Hope this helps...
 

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Discussion Starter #5
Ordered new ground cable just in case to try it out.
As it does looks like its getting ground from parking brake....
 
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