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Blowing the ten amp fuse

 
Old 02-03-2019, 09:30 PM
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75MM
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Default Blowing the ten amp fuse

I keep blowing the ten amp fuse in my 75s fuse block. the diagrams I have don't show the block or whats all on each fuse. Where would I find that?
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Old 02-03-2019, 10:02 PM
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Found this on the net, said its for a 75


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Old 02-03-2019, 10:30 PM
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Thanks Mod75. That's the same pic that's on pg 201 in my Chilton Book, it doesn't list whats on each fuse either.
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Old 02-03-2019, 10:37 PM
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Hey Mod,, your pic got me looking and there is an index of each fuses circuits a few pages later. thanks again for replying. it shows that the seat belt buzzer is on it, that's the first thing Im unplugging,
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Old 02-03-2019, 11:16 PM
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Originally Posted by 75MM View Post
I keep blowing the ten amp fuse in my 75s fuse block. the diagrams I have don't show the block or whats all on each fuse. Where would I find that?
Wrap it in foil and see which wires burn up
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Old 02-04-2019, 09:11 PM
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Originally Posted by ratflinger View Post
Wrap it in foil and see which wires burn up
Yep...used gum wrapper foil in an emergency in the old days. Also liked putting a penny in the old screw-in fuse socket in my house (please don't anybody try this...we are just kidding).

Seriously: best to get the circuit diagrams for your car and carefully trace out the fuse line that is the issue. The Corvette vendors have some colored ones that make it a lot easier. My fuse blowing issue turned out to be a loose bubba wire under the dash that was shorting to the frame.

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Old 02-04-2019, 10:50 PM
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Thx Redvette2, Ill be doing that tomorrow. it wasn't the buzzer, so taking out the gauge panel next. planned on doing it today but had to work late.
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Old 02-04-2019, 10:53 PM
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I know. I worry about each time I burn a fuse while trouble shooting.
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Old 02-04-2019, 11:28 PM
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Originally Posted by 75MM View Post
Thanks Mod75. That's the same pic that's on pg 201 in my Chilton Book, it doesn't list whats on each fuse either.
Buy the Dealer Shop manual and toss that Chiltons in the trash.
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Old 02-05-2019, 03:49 PM
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Sometimes RFI caps fail shorted...you might look if you have one on the back of your gauge panel and see if lifting the lead makes the short go away. Here is a procedure I use when trouble shooting...first disconnect the battery, put a new fuse in, hook up an ohm meter between the fuse and the chassis ground. Watch the meter and see what affect turning on switches or disconnected parts of this particular circuit have on the ohm meter reading. Some things will cause a low ohm reading but if it goes to zero on a low range scale it could be the issue.

Good luck...let us know what you find.

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Old 02-05-2019, 04:24 PM
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Thanks Redvette2. I will remember that for further trouble shooting. I just found what was blowing the Gauges fuse was the headlights up warning button mounted on the drivers side headlight. I saw in the Chilton that the gauges and warning lights were on it so I unplugged the headlight buttons and everythings working ok now exept for the passenger side window that I was having issues with before . The drivers side works but the passenger sides not doing anything. I took the door off and checking the wires where it opens and closes. Im going to see what I can find on trouble shooting power windows and maybe start a new thread if on it if I cant track it down.
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Old 02-05-2019, 04:30 PM
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Also interesting to me was that the windows wont work at all either when the 10 AMP Gauges fuse is blown, The Chilton didn't say anything about the windows on that fuse so maybe something was rewired wrong in the past.
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Old 02-05-2019, 05:55 PM
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Originally Posted by 75MM View Post
Also interesting to me was that the windows wont work at all either when the 10 AMP Gauges fuse is blown, The Chilton didn't say anything about the windows on that fuse so maybe something was rewired wrong in the past.
Windows is the 30 amp circuit breaker.

http://knigaproavto.ru/shemy/en/chev...x-diagram.html

this is from Wilcox, they are very helpful to our hobby. Notice there appears to be a 10 amp fuse with the circuit breaker involved.



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Old 02-05-2019, 06:15 PM
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Are you aware if any work on your car was done before this problem with the fuses. Were kick panels,door panels rempved recntly by anyone? Whatdo4s not work on your car? Is the glass around fuse black, does it blow slow;y or immediately or slowly?
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Old 02-05-2019, 06:33 PM
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Originally Posted by 75MM View Post
Also interesting to me was that the windows wont work at all either when the 10 AMP Gauges fuse is blown, The Chilton didn't say anything about the windows on that fuse so maybe something was rewired wrong in the past.
You aware the RED circle in the schematic below is showing you WHY the power windows do not work when the GAUGES fuse pops.

It is because the power to the window motor relay is going into the IGN cavity in your fuse panel....and the IGN terminal in your fuse panel is getting power FROM the GAUGES fuse. So if the fuse pops.....your windows will work.


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Old 02-05-2019, 07:10 PM
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Dub, doesn’t that 10 amp fuse provide power to the coil for the window relay? It appears to be different on the later C-3s.
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Old 02-05-2019, 07:43 PM
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Originally Posted by Cooter Tech View Post
Dub, doesn’t that 10 amp fuse provide power to the coil for the window relay? It appears to be different on the later C-3s.
YES. The later years models do not use a relay.

Case in point.

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Old 02-05-2019, 09:29 PM
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Thanks Cooter, the diagram is very helpful. I will make use of it. It did throw me off wondering why a 30 amp circuit breaker was through the ten amp gauges fuse.
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Old 02-05-2019, 09:39 PM
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yes it was restored in 2003 a few years before I bought it . its apparent all the wiring has been went through, so far it seems they did well. I saw in the Chilton that a warning lamp is on the gauges circuit and found the headlight up warning button was blowing the gauge fuse . I unplugged it and its ok now. Ill tape it up until I get a new one.
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Old 02-05-2019, 09:50 PM
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Thanks DUB for circling the gauge fuse for me and the info about the relay, I found the passenger door window didn't work after I repaired a broken wire,,, because I took the door off to fix it and hadn't attached it back to the car yet. Because just the door frame wasn't enough of a ground. once hung back on the hinges it works ok now.
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