emmetgilgunn Posted June 9, 2011 Share Posted June 9, 2011 right my series 3 ffr has no raidos fitted she is fairly good nick but last week while driving home there was a small spark from my (loose) ign warning light and then it would not go off. i got home and looked around (using the all charged up series) and traced the problem to te genrator shunt box (the one behind the passenger seat) that had burnt trough a few wires and a capactor (i think) on the top half of it. all my wires and belts seem fine and i have had the dash off to inspect them. all other ancilleries seem to be working but there is no charge going to the batts it was a mark IV box but i have found a mark III to replace it . following some resarch i understand that apart from my ign light no longer working this should be a fine transplant however my questions are 1 is it normal for these to blow or is it a syomptom of somthing else? (there is no point putting a new one in if it will fry as well. 2 is there any way to check my genrator with the panel cover off ie by putting a multimeter across two terminals points? Quote Link to comment Share on other sites More sharing options...
fv1609 Posted June 9, 2011 Share Posted June 9, 2011 Will be brief, having to use phone as have pc problems. Charge light is normally activated on it has to be neutralised to off by power from gen. On mk 4 this supply to neutralise the light comes from the low power diode trio in gen. Also supplies regulator module. You may have destroyed dioes. On mk 3 the trio supply the main relay winding unlike the mk 4. Note that neg supply is earthed inside mk 4, in mk 3 neg is only earthed at shunt box. Measure gen output + X -W on SK1. Quote Link to comment Share on other sites More sharing options...
emmetgilgunn Posted June 10, 2011 Author Share Posted June 10, 2011 thanks for the reply so its worse than i taught. just as well i didnt stick the new box into it yet so. the diodes on the generator 1 are they difficult to source and replace? or is it a specialist job. 2 is it normal for these to go? or again is it a sign of another problem Quote Link to comment Share on other sites More sharing options...
fv1609 Posted June 10, 2011 Share Posted June 10, 2011 First check low power diodes are ok. Check if you have 24v + on F of SK1 with - on W. If no volts there follow tests in ACU4. Unusual to fail unless abused, sounds as if that happened with initial shorting. Make sure of an accurate diagnosis before doing anything! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.