<VV> Blowing fuses

[Hugo Miller]

You are of course quite correct on both counts. I think it was my brain 
that blew a fuse. My apologies.


On 2020-05-03 23:24, Jim Becker wrote:
> What kind of a 12-volt circuit do you think is going to blow a
> 12-volt bulb? I defy you to draw a circuit diagram that does that.
>
> Yes, this fuse feeds a connection to the headlight switch.  If the
> fuse was downstream of the tail light contacts in that switch,
> everything on that fuse would go on and off with the tail lights.  
> I'm
> pretty sure the tail lights don't have to be on for the clock or dome
> lights to work.
>
> I suggest you go study Ohm's law for a while.  If you get that
> figured out, you might want to look at a Corvair wiring diagram.
>
> Jim Becker
>
> -----Original Message----- From: Hugo Miller via VirtualVairs
> Sent: Sunday, May 03, 2020 3:41 PM
> To: virtualvairs at corvair.org
> Subject: Re:  Blowing fuses
>
> Haha if your test lamp lights up, all it means is there is current
> flowing. If there is a dead short, you will blowing test bulbs 
> instead
> of fuses ;)
> That fuse doesn't feed the light switch, does it? The tail light fuse
> has to be downstream of the light switch, surely?
>
> On 2020-05-03 20:28, Jim Becker via VirtualVairs wrote:
>> First thing, I would probably hook a test lamp across the blown 
>> fuse.
>> That will save a whole pile of blown fuses.  Any time it lights, a
>> fuse would have blown.
>>
>> Cursory inspection of exposed wires isn't likely to find anything.
>> If there is damaged wire insulation, it will probably be due to a
>> pinched wire in some obscure location.  Additionally, I don't 
>> believe
>> any engine compartment wires powered through that fuse will be hot
>> unless the brake lights or tail lights are on.  Likewise, the 
>> problem
>> is unlikely to be anywhere downstream of a properly working switch 
>> in
>> the off position.
>>
>> Isolating parts of the circuits that are powered by the fuse will
>> narrow down the area to look.  The first suspect on my list is the
>> headlight switch.  Heat from the headlight circuit breaker can 
>> damage
>> both plastic parts and contacts.  So remove and unplug the switch.
>> Just removing the switch so the switch frame isn't grounded may stop
>> the fuse from blowing. If it still blows, unplug the switch.  If it
>> still blows, the trouble could be in the dome lights etc. circuits.
>> If the removing or unplugging made the fuses quit blowing, it was
>> almost certainly the switch.
>>
>> Jim Becker
>>
>> -----Original Message----- From: Kent Goddard via VirtualVairs
>> Sent: Sunday, May 03, 2020 12:12 PM
>> To: virtualvairs at corvair.org
>> Subject:  Blowing fuses
>>
>> 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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>>
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