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Friend has problem with blown fuses - Solution?
Posted by: Tom Rahochik ()
Date: July 11, 2019 08:02AM

A quote from a Corvair friend of mine.....
" My 66 keeps blowing the 10 amp fuse shutting off the taillights dash and interior light
I have checked the dash ground and wiring looks perfect"

Solution? All opinions on other areas to check are appreciated.......

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Re: Friend has problem with blown fuses - Solution?
Posted by: joelsplace ()
Date: July 11, 2019 08:31AM

The ground side won't blow fuses.
Does it blow them immediately? That will make it easier to find.
If it does, start by taking out the bulbs the fuse operates and see if it is still shorted.
Hopefully he has a meter so he can check it.

Joel
Northlake, TX
5 Ultravans, Lost count at 100 Corvairs...




Edited 1 time(s). Last edit at 07/11/2019 08:32AM by joelsplace.

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Re: Friend has problem with blown fuses - Solution?
Posted by: Marco_a_p ()
Date: July 11, 2019 01:13PM

seen that happen with the dome light wire gets caught between the steering column and the dash. Open the door and ZZZTTT...POOF! no more fuse winking smiley

Marco
A 62 Monza Wagon, a 63 GB 8door, a 62 R/s and a 65 Corsa Turbo coupe..

Hanging out with the scorpions, king snakes, road runners, coyotes and quails In the southern desert of the silver state
Mesquite NV 89024

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Re: Friend has problem with blown fuses - Solution?
Posted by: Lane66m ()
Date: July 11, 2019 01:43PM

Pull dome light bulb and see if problem is fixed. If so, find short on dome light wiring.

Al Lane
Ellabell, GA 31308

1966 Monza Coupe, 110 hp, 4 Spd
1966 Monza More Door 110 hp, PG
1968 Camaro SS Coupe 350 CI 295+ hp PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
1947 Farmall A tractor 15 hp


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Re: Friend has problem with blown fuses - Solution?
Posted by: joelsplace ()
Date: July 11, 2019 01:49PM

If there is a short in the dome light wiring taking the bulb out won't help.

Joel
Northlake, TX
5 Ultravans, Lost count at 100 Corvairs...

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Re: Friend has problem with blown fuses - Solution?
Posted by: nygiantfn ()
Date: July 11, 2019 03:34PM

Hi,
I have a 65. Same thing started to happen. After some investigating. Our local Corvair club said diagnosed it was the headlight switch. I replaced the switch and that corrected the problem. Hope this helps

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Re: Friend has problem with blown fuses - Solution?
Posted by: MattNall ()
Date: July 11, 2019 03:50PM

Tail lights [ markers] are also on that circuit.

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Friend has problem with blown fuses - Solution?
Posted by: MattNall ()
Date: July 11, 2019 04:31PM

Also on a '65..... Backup switch / lights!!!

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Re: Friend has problem with blown fuses - Solution?
Posted by: oldqmguy ()
Date: July 11, 2019 04:36PM

You need to find out when the fuse blows:

As soon as it is installed? You have a short circuit!

If not:

When you open the driver's door?

When you open the passenger door?

When you step on the brakes?

At random?

Once you determine "when" you will know what circuit to test!

Have you added additional lights that will draw more than 10 amps?

These are always fun to fix!

Dale cool smiley

Dale E. Smiley CPBE
Life Member The Society of Broadcast Engineers
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT
CORSA/Circle City Corvairs/Corvair Performance Group
Avon, Indiana
WB9SFF
1967 4-Door Monza PG!

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Re: Friend has problem with blown fuses - Solution?
Posted by: Lane66m ()
Date: July 11, 2019 04:54PM

It is the star of troubleshooting. Easiest thing to do. It will determine if short is down stream of bulb. btdt.

Al Lane
Ellabell, GA 31308

1966 Monza Coupe, 110 hp, 4 Spd
1966 Monza More Door 110 hp, PG
1968 Camaro SS Coupe 350 CI 295+ hp PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
1947 Farmall A tractor 15 hp


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Re: Friend has problem with blown fuses - Solution?
Posted by: Frank DuVal ()
Date: July 11, 2019 07:12PM

Quit buying and blowing fuses!

Take a headlamp, attach two wires to a working filament and put these wires on the fuse terminals instead of the fuse. Alligator clips usually work for these SAE auto style fuses.

Now, wiggle harnesses, remove light bulbs, etc until the headlamp goes out or very dim. There was your short.

If you put long leads on the headlamp, you can trouble shoot all the way to the engine compartment.smileys with beer

Frank DuVal

Fredericksburg, VA

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Re: Friend has problem with blown fuses - Solution?
Posted by: jjohnsonjo ()
Date: July 11, 2019 07:42PM

There are other things down stream of that 10 amp with lighter fuses. If someone put a bigger fuse in one of those and there is a problem with that circuit, the 10 will go first.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: Friend has problem with blown fuses - Solution?
Posted by: joelsplace ()
Date: July 11, 2019 09:01PM

Al,
Dual filament bulbs can cause problems but I don't see how a dome light bulb could.
Please explain.

Joel
Northlake, TX
5 Ultravans, Lost count at 100 Corvairs...

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Re: Friend has problem with blown fuses - Solution?
Posted by: MattNall ()
Date: July 11, 2019 09:20PM

joelsplace Wrote:
-------------------------------------------------------
> I don't see how a dome light bulb could.
========================================================

Only if someone put a screw thru metal above it and screwed thru the wire!
[ friend's 79 Dodge truck....wires are under driver's threshold plate!].

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Friend has problem with blown fuses - Solution?
Posted by: joelsplace ()
Date: July 11, 2019 09:55PM

Taking the bulb out wouldn't stop the fuse blowing.

Joel
Northlake, TX
5 Ultravans, Lost count at 100 Corvairs...

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Re: Friend has problem with blown fuses - Solution?
Posted by: cnicol ()
Date: July 11, 2019 09:58PM

Frank DuVal Wrote:
-------------------------------------------------------
> Quit buying and blowing fuses!
>
> Take a headlamp, attach two wires to a working filament and put these wires on the fuse terminals instead of the fuse. Alligator clips usually work for these SAE auto style fuses.
>
> Now, wiggle harnesses, remove light bulbs, etc until the headlamp goes out or very dim. There was your short.
>
> If you put long leads on the headlamp, you can trouble shoot all the way to the engine compartment.smileys with beer

That's pretty close to what I do except I use an old key-buzzer. When the short happens, you can hear it. For these methods to work, light bulbs in the circuit must all be removed. Buzzer goes off or light shines bright; there's your short!

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: Friend has problem with blown fuses - Solution?
Posted by: Richard ()
Date: July 11, 2019 11:41PM

Tom Rahochik needs to answer oldgmguy's questions.

"You need to find out when the fuse blows:
As soon as it is installed?
At random?

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Re: Friend has problem with blown fuses - Solution?
Posted by: Frank DuVal ()
Date: July 12, 2019 11:48AM

Ah, Craig, but with a headlamp the current requirement to light the filament in the headlamp is high enough to not need to remove any bulbs from the circuit under test. Unless it is the headlamp circuit....grinning smiley

Frank DuVal

Fredericksburg, VA

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Re: Friend has problem with blown fuses - Solution?
Posted by: Lane66m ()
Date: July 12, 2019 03:24PM

Why not first unplug any plugs that are in the side of the fuse box at that location? Then see if a power drain is there with a lamp (remove fuse). If not, must be one of the circuits that was unplugged. Then plug one circuit in at a time to see which one is draining power.

Al Lane
Ellabell, GA 31308

1966 Monza Coupe, 110 hp, 4 Spd
1966 Monza More Door 110 hp, PG
1968 Camaro SS Coupe 350 CI 295+ hp PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
1947 Farmall A tractor 15 hp


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