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Achhh so many questions!
The first, that blew in about a minute, was 15amp. My spares were too
large to fit in that fuse holder, so I replaced the fuse holder, then
blew a 20, then a 25. (none slo-blo) There are 2 lamps on the circuit,
in parallel, nothing else. The control side has its own fuse.
Thanks!
Steve
wrote:
> Steve--The resistance is almost right. It has to be low if you're going to
> draw 8 amps in a 12 volt system. 12 v/ 8 1/3 a= 1.44 ohms. Fuses don't blow
> because of resistance, except indirectly. They blow because of excessive
> current. So the question is why is there excessive current and is it
> changing? To answer those questions, we need to know several things:
>
> 1. Were all the fuses the same or was the first one a slow blow fuse, the
> second medium, and last two fast blow fuses? Fuses are designed to open at
> different rates for different applications.
>
> 2. What size fuses are you using?
>
> 3. Is the lamp the only thing on the fuse or are there other loads?
>
> 4. Is the relay on the same fuse as the lamp? The relay signal is a control
> signal that controls the power to the lamp. If they are both on the same
> fuse, then a shorted control side of the relay could draw excessive amp. If
> that is the problem, you need to check the control wiring when replacing the
> relay because that wiring is not likely intended to carry the amount of
> current necessary to blow the fuse.
>
> This is just to get a start.
>
> David Sill
> Via Bella
>
>
>
> Quoting Steve Wight <>:
>
>
>> Got a new 100w halogen, but it blows fuses. Thought I found my problem
>> when my meter showed VERY low ohms on the light, but 100 W / 12 V = ~8
>> amps, and if P = I^2*R still, then R = ~ 1.4 ohms ??? This just seems
>> very very low. The first fuse took about a minute to blow, the second
>> about 15s, the next two instantly. Does a relay fail like that? (the
>> switch feeds a relay which feeds the light)
>>
>> Steve
>> Fales, 'Gulli'
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