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Battery relay? Next to start stop battery MY16
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skinda0
 


Member Since: 11 Dec 2023
Location: Kent
Posts: 15

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4
Battery relay? Next to start stop battery MY16

Hi all,
I have been having intermittent battery voltage issues as you may have seen from my other posts. I was looking today for the grommet location in the driver's side to get into the cabin. I noticed that the battery relay? Near the second aux battery had a wire with some dark banding on it. Bit odd I thought and on closer inspection, the plastic bolt head was deformed and melted! Looks like the terminal has been loose for some time. Checking the rest, they were all loose!

I went to tighten them up, 2 did tighten, but the melted one just spun above the metal clamping section of the bolt.

Does anyone have a part number for the bolts please?

Click image to enlarge


Click image to enlarge
 2016 Discovery 4 HSE
2011 Nissan Pathfinder 
 
Post #23638287th Mar 2024 5:30 pm
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HairyFool
 


Member Since: 04 Jan 2023
Location: Essex
Posts: 576

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto ZanzibarDiscovery 4

The PSDB (Power Supply Distribution Box) is essentially the split charge relay. The retaining bolts are not available as a seperate part from Land Rover and the PSDB is over £1000 from LR (eBay is your friend) unfortunately at least one on eBay has no nuts fitted.

However looking at the photo I suspect the cause of the melting may be the eyelet crimp on the top stud is making a poor contact and heating up under load. This would need to be fixed as well
 A visitor from the dark side, my other vehicle is an MG5 EV  
Post #23638327th Mar 2024 6:45 pm
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skinda0
 


Member Since: 11 Dec 2023
Location: Kent
Posts: 15

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

I did a quick search and I think I did find that relay before I posted!

Yes that one especially was loose when I found it. Is there anything special about them? What would be stopping me replacing them with a standard nut and putting a rubber cap over it for isolation?

I'll see if I can get a better photo of the damage to the nut tomorrow, my only concern is getting it off as the cap has disconnected itself from the nut!
 2016 Discovery 4 HSE
2011 Nissan Pathfinder 
 
Post #23638367th Mar 2024 7:16 pm
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HairyFool
 


Member Since: 04 Jan 2023
Location: Essex
Posts: 576

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto ZanzibarDiscovery 4

It should possible to cut the plastic shell off the nut. It is a standard thread so a nut will fit, you may find the one in the plastic is a spline rather than hex.

The nut itself may even be tight, my concern from the photo is the eyelet crimp connection to the cable. I know of a number of examples with poor crimps on engine earth so there is no specific reason why it wouldn't also be an issue with a battery cable.
 A visitor from the dark side, my other vehicle is an MG5 EV  
Post #23638397th Mar 2024 7:36 pm
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skinda0
 


Member Since: 11 Dec 2023
Location: Kent
Posts: 15

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

The terminal was loose when I found it so I think the heating and subsequent discolouration of the eyelet and melting of the nut were all part of the high resistance joint.

I'll check out the cable tomorrow, if I need to re-crimp it I have got all the kit for it. I may ask any local breakers if they have got any nuts on any they have, and might as well get a battery cable while I'm at it.
 2016 Discovery 4 HSE
2011 Nissan Pathfinder 
 
Post #23638407th Mar 2024 7:47 pm
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