alternator / charging

Jake the Peg Jul 8, 2019

  1. Jake the Peg

    Jake the Peg Well-Known Member I am in scotland

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    Today I fitted a new alternator in the hope that the dash warning lights Christmas tree would go out, but no luck, So some further checking, with the supplier, and fluke, I should see 12 v on all 3 wires on the alternator loom, but I don’t see any voltage on the white wire (battery voltage) if I bring 12v to the white wire I see 14.2v and a nice dark dash panel, so I assume I have a break in the white wire somewhere, charge fuse is ok..

    I seem to remember reading about someone else finding the broken wire, but I can’t seem to find the post again, so before I start pulling things apart, can anyone point me in the right direction, yes it could be broken anywhere but no harm checking where someone has found it before!

    Thanks

    J
     
  2. Jake the Peg

    Jake the Peg Well-Known Member I am in scotland

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    Rather than be totally lazy, I decided to just get a move on and start chasing the wiring, I found the white wire that connects to a small junction box then up to the passenger battery+ snapped had dropped down below the 24v starter gizmo, so an easy fix, all the dash warning lights out and a nice steady 14.2v charge over the batteries

    Next job steering box seals.....
     
  3. Dave 2000

    Dave 2000 Well-Known Member Supporter I am in spain

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    I had exactly the same problem, it is the battery voltage sense wire, it is white in a black sheath. I just replaced my VSR and found that wire had corroded where it connects to an insulated body mount. I must have disturbed it as I only had the problem after working in that area, I cut out the connector and run a new wire to the VSR, the type of problem you might get if out on a rough road miles from the 'Grua'. :icon-wink:

    Glad you found it.

    regards

    Dave
     
  4. StarCruiser

    StarCruiser Well-Known Member Supporter Guru I am in uk

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    The short broken wire was almost certainly a fusable link. It should be replaced with same or have a fuse spliced in immediately it leaves the battery terminal else fire could result if the alternator goes bad or if a short is presented on that wire. A 10A fuse should be ample but needn’t be that big as it only senses and doesn’t actually draw current.
     
    clivehorridge and Jake the Peg like this.
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