<VV> Fwd: Re: Blowing fuses
hugo at aruncoaches.co.uk
Sun May 3 16:42:43 EDT 2020
Yes, that is what you said. But then you went on to suggest focussing
efforts on those circuits, but any short circuits after the lamp on the
switching side will just bring the light on and not blow the fuse.
I would be looking for any circuits that are live when everything is
switched off, as it blows fuses when everything is off. That means
either the clock, or the wiring after the fuse but BEFORE the courtesy
lamp. Might even be the clock itself - maybe run a seperate feed to the
clock & see if actually tells the time!
Maybe that's what you meant, but I don't think it was clear.
On 2020-05-03 20:02, Bryan Blackwell wrote:
> Yep, that's what I said. The dome light and glove box are switched
> on the ground side. Brake and tail are switched on the hot side.
>> On May 3, 2020, at 2:55 PM, Hugo Miller via VirtualVairs
>> <virtualvairs at corvair.org> wrote:
>> Forgive me for butting in, but I don't think this is clear; the
>> courtesy light for sure is grounded by the door switch. Possibly the
>> glove box also. So anything that goes to ground on those circuits will
>> just bring the light on and nothing else.
>> If there is a short between the fuse and the lamp itself, that will
>> blow the fuse. But downstream of the lamp it won't.
>> I think the only thing to do is trace every circuit that is fed by
>> that fuse. The light switch itself must be upstream of the fuse, in
>> which case you can rule out the tail lamps and brake lights as the
>> fuse blows with the lamps off and presumably without your foot on the
>> You need to find a circuit that is live with everything switched
>> off, and that to me points either to the clock, or to the wiring
>> between the fuse box and the courtesy lamp or glovebox lamp. Have a
>> peek under the dash to see if the wires to the glove box lamp or dome
>> light have chafed through on anything.
>> Kenworth trucks, incidentally, have a brilliant system whereby there
>> are no live feeds to the dash; every switch on the dash simply grounds
>> a relay that activates the circuit. So if anything shorts out behind
>> the dash, instead of the truck going up in flames, all that happens is
>> that a circuit comes on when it shouldn't. Clever.
>> On 2020-05-03 19:36, Bryan Blackwell via VirtualVairs wrote:
>>> As I recall the tail and brake have the switch control the hot
>>> but the glove box and dome/courtesy are switched on the ground side
>>> I would focus your efforts on those.
>>>> On May 3, 2020, at 1:12 PM, Kent Goddard via VirtualVairs
>>>> <virtualvairs at corvair.org> wrote:
>>>> The 10 amp fuse protecting the tail/brake lamps, glove box and
>>>> courtesy lamps and clock (etc?) in my '66 Corsa blows upon
>>>> insertion, even with lamps off. My level of electrical expertise is
>>>> low, but it sounds like a direct short to ground. I've done a
>>>> cursory inspection of exposed wiring in the engine compartment and
>>>> under the dash and haven't found any damaged insulation. Any
>>>> suggestions of most likely problem areas that I should investigate
>>>> first?? Thanks.
>>>> Kent G
>>>> St. Louis, MO
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