|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
06-07-2020, 01:28 PM | #1 |
Senior Member
Join Date: Mar 2019
Posts: 121
|
blown fuse problem
How do you find out why the fuse blew ?? As soon as you put a new fuse in and turn the key on it blows Thank you in advance !!
|
06-07-2020, 02:31 PM | #2 |
Senior Member
Join Date: May 2016
Location: Scottsdale, Arizona
Posts: 612
|
Re: blown fuse problem
Good afternoon...I believe that you have developed a short. Start at the battery and trace your wiring system and see where the problem is. Go step by step with a test light or a metre and see what you can find. The last one that I traced was a loose crimp on the back of an Amp Meter...another was the actual fuse holder had become loose at the rivet and shorted. Good Luck...Ernie in Arizona
|
Sponsored Links (Register now to hide all advertisements) |
|
06-07-2020, 02:33 PM | #3 |
Senior Member
Join Date: Oct 2014
Location: Central New Jersey
Posts: 408
|
Re: blown fuse problem
You'll have to disconnect circuits to stop it. Is it really as you turn the key, or do you have your foot on the brake as is a normal thing to do? Turning the key only and it blows...I'll defer to the experts.
My experience has been bad stop light switches twice. Took the wires off the switch no more blown fuse. |
06-07-2020, 02:52 PM | #4 |
Senior Member
Join Date: May 2010
Location: Southern California
Posts: 7,033
|
Re: blown fuse problem
What size fuse are you using? Common causes would be bare wires shorting. If the fuse blows when you turn on the key you know it is in that circuit. Good luck.
Charlie Stephens Last edited by Charlie Stephens; 06-07-2020 at 05:50 PM. |
06-07-2020, 04:17 PM | #5 |
Senior Member
Join Date: May 2010
Location: Largo Florida
Posts: 7,225
|
Re: blown fuse problem
Take off the battery ground cable. Connect a test light or volt meter to that cable end and the battery post. Turn the key on. The light should light or meter should meter. Keep disconnecting things electrical until the light or meter go out and stop reading the draw,,, thats your problem.
|
06-07-2020, 04:20 PM | #6 |
Senior Member
Join Date: May 2010
Location: So Cal
Posts: 8,755
|
Re: blown fuse problem
Sponsored Links (Register now to hide all advertisements)
|
06-07-2020, 04:39 PM | #7 |
Senior Member
Join Date: Mar 2019
Posts: 121
|
Re: blown fuse problem
Yes it is !
|
06-07-2020, 05:33 PM | #8 |
Senior Member
Join Date: Mar 2017
Location: Connecticut Shoreline
Posts: 1,824
|
Re: blown fuse problem
If the fuse isn’t blowing until you turn on the key, than I would say the problems is after that. In the ignition side.
You should be able to rule out anything before ignition switch. Should not be hard to find. Check wire in distributor, etc. Good luck. |
06-07-2020, 05:58 PM | #9 |
Senior Member
Join Date: May 2010
Posts: 702
|
Re: blown fuse problem
Could be lots of things, but if your wiriing is in a metal conduit make sure the conduit has not moved and is making contact inside the terminal box with the driver's side post.
|
06-07-2020, 06:22 PM | #10 |
Senior Member
Join Date: Mar 2019
Posts: 121
|
Re: blown fuse problem
So I tried another box of fuses and it WORKED !!
|
06-07-2020, 06:24 PM | #11 |
Junior Member
Join Date: Aug 2019
Location: West Haven, Connecticut
Posts: 19
|
Re: blown fuse problem
Had an issue with my car everytime I turned on the headlights the fuse would blow I pulled the conduit and the original harness was cut and spliced and shorted to the inside of the conduit so I put a new harness and everything is good now no shorts
|
06-08-2020, 07:06 AM | #12 |
Senior Member
Join Date: Nov 2011
Location: Greenwood SC
Posts: 294
|
Re: blown fuse problem
I hope you didn't go to a larger amp fuse.
|
06-08-2020, 08:58 AM | #13 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,440
|
Re: blown fuse problem
With the original pop out switch, you can turn on the key and nothing is even hot yet if the points are open since the switch was in the breaker side of the circuit. No telling how it's wired now.
|
06-08-2020, 11:29 AM | #14 |
Senior Member
Join Date: Mar 2019
Posts: 121
|
Re: blown fuse problem
What size fuse should it take ??
|
06-08-2020, 12:10 PM | #15 |
Senior Member
Join Date: May 2019
Location: Fort Worth side of DFW
Posts: 171
|
Re: blown fuse problem
|
06-08-2020, 01:50 PM | #16 |
Senior Member
Join Date: May 2010
Location: Largo Florida
Posts: 7,225
|
Re: blown fuse problem
So you had a box of defective fuses ?
I'm thinking you might have gone to a heavier fuse which means there may still be an issue unless the other fuses were too light. |
06-08-2020, 05:23 PM | #17 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,440
|
Re: blown fuse problem
A good thing to remember is that fuses are there to protect the wire. Each wire size (American wire gauge) will use a different size fuse. A 10 gauge wire will handle 30-amps. If it's any smaller than that, a person would need a smaller fuse. 12 gauge would be 20-amp and 14 gauge would be 15-amp. A lot of 6-volt stuff in only 16-gauge and the proper size fuse for that is a 10-amp fuse. You can use smaller fuses for each size if you wish but you shouldn't use larger sizes. Under a short to ground condition, the wire can catch fire before the fuse blows if a person doesn't size it right. I've seen it happen and it burns quick.
|
06-08-2020, 06:03 PM | #18 |
Senior Member
Join Date: Mar 2019
Posts: 121
|
Re: blown fuse problem
I put a 20 amp fuse in. Is that OK ?
|
06-08-2020, 07:38 PM | #19 |
Senior Member
Join Date: May 2019
Location: Fort Worth side of DFW
Posts: 171
|
Re: blown fuse problem
A 20 Amp fuse is under the 30 AMP rating so it is "safer" but you may exceed the rating and burn the fuse. IF you do not burn the fuse with all your lights on during maximum amperage draw then a 20 AMP will work; if you burn the fuse then increase to the 30 AMP rated fuse.
NEVER go above the 30 AMP fuse or you will damage the wiring in the car and may start an electrical fire which can destroy your car... |
06-09-2020, 09:43 AM | #20 |
Senior Member
Join Date: Dec 2017
Location: Guthrie, OK
Posts: 1,145
|
Re: blown fuse problem
20A is appropriate to the 12 AWG wire between battery and generator and will handle the draw of the original lighting system. 50CP bulbs may give you a problem. Most guys use a 30A fuse because, you know, nobody's seen those wires in flames, have they?
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|