Inlet preheater works on alternator but not battery

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

  1. loudtom

    loudtom Road Train Member

    Aug 26, 2016
    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.
    KB3MMX Thanks this.
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