Inlet preheater works on alternator but not battery

Discussion in 'Volvo Forum' started by loudtom, Nov 27, 2022.

  1. loudtom

    loudtom Road Train Member

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    2012 VNL D16
    I'm getting battery voltage at the relay with the engine off. When I engage the preheater before starting the truck, it gives me error #1 and #2. When I start the truck, it works normally without error codes. Does this mean that my problem is in one of the cables from the alternator to starter to batteries? I would think I should have other symptoms, like the alternator not charging the batteries or starter issues, but everything else seems normal.

    I've replaced the batteries, the preheater element, and the relay.
     
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