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Thread: Alternator SDV6, anyone upgraded for larger than stock 150A??

  1. #1
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    Alternator SDV6, anyone upgraded for larger than stock 150A??

    As the title states, has anyone upgraded the stock 150A alternator for something greater?

    The stock alternator is inadequate for supplying charge to multiple DCDC charger(~40 - 60amp additional load) and insufficiently supply power to Redarc Tow Pro Elite brake controller WHEN the DCDC charger is in Boost stage. Mine and 2 other vehicles with similar setup suffers the tow pro elite (red blinking) while dcdc is boost stage demand. Each of these vehicles had their installations installed by different installers. When the dcdc charger are out of boost stage, the Redarc tow pro elite will stop blinking and become normal state.

    During this time, the brake controller do work normally.

    There is no other reason why the dcdc and brake controller correlate other than insufficient power supply charge to the starting battery.

    Redarc tow pro elite trouble shooting suggests it a ground issue, but the fact this happens in multiple D4, with various combination of setup is leading me to believe itís alternator related.

    150A is in the small side.

    Also, if we charge the camper batteryís 100% using AC/DC before attaching to the D4, the Redarc tow pro brake controller do not suffer the issue, since the DCDC is in either absorption or float charge state.
    Regards
    Imaz

    2012 D4, SDV6

  2. #2
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    Could it be that your cranking battery is on it's last legs and that by chance the same is happening in the other vehicle? Just thinking out loud here.
    Rod

    D4 MY16 5 seat TDV6 - LLAMS, Custom Drawers, OL Bar, Wildpeak AT3W, GOE Rims, Lithium DBS, eDiff, Outback Accessories Long Range Tank, GAP Tool, Rhino Pioneer Platform rack, Mitch Hitch, TPMS & Safari Snorkel

  3. #3
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    Hmmm. There are larger alternator options if thatís something you wish to try, however Ö.

    Firstly get proof the alternator is the cause. Iím guessing you donít have an IIDTOOL that you can actually see the alternator charge state/output at these times too verify itís at 100% capacity?

    Secondly, your DCDC charger isnít any more drain than anyone else charging batteries whilst driving. In fact, your DCDC limits the possible charge compared to directly connected batteries and yet no one else has reported this issue.

    So, about your tow pro installation - have you run it directly from the battery using its own heavy gauge wire?
    Did you also run heavy down through the car from the controller for the brake power?
    Where is it earthed?
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  4. #4
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    Quote Originally Posted by rocket rod View Post
    Could it be that your cranking battery is on it's last legs and that by chance the same is happening in the other vehicle? Just thinking out loud here.
    Possibly, my starting battery was replaced in 2019. The other car is around Nov 2018. Unsure of the third car.
    Regards
    Imaz

    2012 D4, SDV6

  5. #5
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    Quote Originally Posted by DiscoJeffster View Post
    Hmmm. There are larger alternator options if thatís something you wish to try, however Ö.

    Firstly get proof the alternator is the cause. Iím guessing you donít have an IIDTOOL that you can actually see the alternator charge state/output at these times too verify itís at 100% capacity?

    Secondly, your DCDC charger isnít any more drain than anyone else charging batteries whilst driving. In fact, your DCDC limits the possible charge compared to directly connected batteries and yet no one else has reported this issue.

    So, about your tow pro installation - have you run it directly from the battery using its own heavy gauge wire?
    Did you also run heavy down through the car from the controller for the brake power?
    Where is it earthed?
    Speaking of my setup, Iím using rated 30amp cabling to the tow pro supply, earthed at the ground stud near the starting compartment. The other cars are cabled similar it seemed.

    I do not have the IIDTool.
    Regards
    Imaz

    2012 D4, SDV6

  6. #6
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    Quote Originally Posted by imaz View Post
    Speaking of my setup, Iím using rated 30amp cabling to the tow pro supply, earthed at the ground stud near the starting compartment. The other cars are cabled similar it seemed.

    I do not have the IIDTool.
    Have you got any sort of battery monitor to check voltage in these conditions?
    If at first you do not succeed, maybe your just no good and should quit!

  7. #7
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    Tim will chime in soon. But if you're car sees a perfectly full main battery at start up. It's going to put less in the battery on purpose. If the dcdc was drawing the main down to 12.3v for example. The charge rate would be higher.

    Blue tooth battery monitors would be a great tool for these test. The free app will log your battery voltage
    If at first you do not succeed, maybe your just no good and should quit!

  8. #8
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    Can you confirm that your DC-DC charger is earthed to a body stud, not to the battery?
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

  9. #9
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    Splitting hairs, but according to the WSM itís a 180A alternator on the 3.0Ltr V6 diesel (TDV6/SDV6). The 3.0ltr supercharged (SCV6) has a 150A one.
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    2014, MY14 Discovery TDV6, Fuji White (2018-Now)
    2003, Discovery 2a, Td5 Manual, Zambezi Silver (2012-2018)
    2007, Adventure Offroad Campers, Grand Tourer (2015-Now)

  10. #10
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    Quote Originally Posted by Graeme View Post
    Can you confirm that your DC-DC charger is earthed to a body stud, not to the battery?
    Yes. Great point!
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

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