 | Home > Puma (Tdci) > Boomslang loom fuse rating. |
 
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4194   
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That’s quite a lot of headroom room for a H4 bulb even with both filaments lit. If the boomslang wiring is up to 25 amps I wouldnt worry. But you could probably come down to 15 if you are concerned. Perhaps they have allowed a bit of margin for those who fit higher wattage bulbs? 2007 110 TDCi Station Wagon XS
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16th Nov 2018 9:40am |
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| Clive Member Since: 21 Mar 2014 Location: Littleborough Posts: 467 
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The fuse it there primarily to protect the wiring in the event of a short, so a bit of overkill won't do any harm so long as the wiring is suitably rated. Better that than to risk the fuse blowing randomly resulting in no lights.
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16th Nov 2018 9:54am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17319 
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15A is quite sufficient for a single headlamp, but not for a pair. 25A is sufficient for both headlamps.
When I rewired mine I used a single feed, initially with a 15A fuse, to two relays, one for dip and one for main beam. This was entirely satisfactory until the first time I flashed the headlights whilst I had the dip beam on, which of course adds the main beam filament to the mix. This immediately caused a sudden onset of total darkness in a very traditional Lucas manner. Since replacing the 15A fuse with a 25A fuse I can now flash to my heart's content both day and night. I am unfamiliar with the Boomslang loom (since I can see no point buying a product I can make better myself) but I am intrigued that it has one fuse per light unit. I would have expected there to be two relays, one for main and one for dip, either with a single fused feed to both or less probably independent fused feeds to each. From your question, if there is a separate fuse for each light I would infer that the fuse is 'downstream' of the relay, which seems highly unsatisfactory! Perhaps someone who is familiar with this loom could outline how it is designed? |
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16th Nov 2018 10:11am |
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| Clive Member Since: 21 Mar 2014 Location: Littleborough Posts: 467
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Yes I must admit, thinking about it, mine, (Boomslang,) has only a single fuse in the battery cable feeding both relays.
Maybe they've changed the design recently? |
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16th Nov 2018 10:58am |
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| ARC99 Member Since: 19 Feb 2013 Location: North Yorkshire Posts: 1831 
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Blackwolf…………….. The loom is single feed from the battery which then divides into two cables , each cable then has a 25 amp fuse, then a relay . From the relay each headlight has its own cable and H4 connector. Each relay is triggered by a supply taken from the redundant nearside headlight connector. Don't make old people mad.
We don't like being old in the first place, so it doesn't take much to  us off.
Richard |
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16th Nov 2018 2:45pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17319
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OK thanks, I now understand. It is an odd way to do it, since the fuse should be as near to the source as possible (in my case the fuse is within inches of the battery). I understand that the Boomslang loom gets its power from the alternator rather than the battery, so perhaps this is the reason.
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16th Nov 2018 3:16pm |
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