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Blowing a 70 amp fuse must have a short some

Blowing a 70 amp fuse must have a short some place

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Why does my 20 amp fuse blow when the engine is running, but work without issue when the engine is off?


Why fuses blow or how to find short circuits or drains !

fixkick.com/power-elect/blows-fuse.html
(the Park (tail-running) lamps go to up to 20+ places) ... The below covers shorts in the cab box, not the 50-100 amp engine bay fuse box that loves to rust out.

Nov 02, 2015 | 2013 RAM - 1500

1 Answer

1990 Honda Acura Legend keeps blowing 70 amp battery fuse while driving


Maybe there's a short somewhere check wiring coming from fusebox

Aug 21, 2015 | 1990 Acura Legend

2 Answers

I have a problem with the 15 amp efi fuse blowing on my 2001 toyota camry. As well as the 15 amp gauge fuse blowing


if there is no shorts, rig a amp meter in series in place of the fuse, if it reads around twelve or more amps some thing else may be wired into the circuit , if the reading is very high there may be a short to earth some ware.

Jul 02, 2015 | Toyota Cars & Trucks

1 Answer

How do i tace the cuuse


trace the cause of a lamp fail 97 wrangler.
fuse blow for shorts, (preventing the fire)
so, there are only 3 ways to find shorts,

  1. visual inspection ever inch of shorted wire, (luck happens)
  2. pull all loads off the wire feed, is short not gone (BINGO?>)
  3. use an AMMETER, this is what we use, to get them all.

one nice way to find shorts,(not wanting to blow 100 fuses)
is to remove the blown fuse ATC and put in a Circuit breaker ATC fuse in that place, not it trips , cools off and repeat the trip
this allows for fast testing (meter) and pulling loads, checks.

your car is jeep TJ
and the wiring is free here.
the schematic tells you all things that can short to this node.
click wiring,
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service
Tail/park shorts, (lots of loads, the highest of all wires it is)
answers USA only not export and no DRL light option.
we are tracing the complex path called PARK (tails)
see chapter 8W that be IT.
and page. pdf page # 8w-40-7 (pdf #93)
turn the dash dimmer to lowest, still blow fuse.
no, then the short is not in cab (easy huh?)
so parks are shorted, see 8W-50 (pdf 134)
see park there/ see those fues # which one blew, that is a big CLUE.
my guess is fuse 1, (others are head lights)
F1 blows
main HL switch park pin 9 ,black yellow wire feed.
see that?
see 8w-50-4 then page 5 , see all rear parks.
then see page 8w 70-20 for fogs.

there you go... i cant teach you how to use and ammeter.
so google that.
see all those junction C connectors, all can be pulled to isolate that short.

see connector C110 , pulling that isolates front parks
conn C322 , pulling that isolates tail parks.

as you see park feed is hug (simple) but huge, lots of places to short
and big time short if trailer wiring hacks are on car. look first.

Feb 12, 2015 | 1997 Jeep Wrangler

1 Answer

Renault traffic 51 plate. whats the 70 amp large 2 prong fuse for in the box under the water expansion bottle.its on the bottom end of the row of 60 amp fuses mine keeps blowing it might be the reason for...


With the car off, replace the fuse and use an Ohm meter to search for a short or a faulty component. Could possibly be the electric cooling fans but that is just a speculation without the car or a service manual in front of me.

Aug 19, 2014 | Cars & Trucks

1 Answer

M38 fuse keep blowing


the parts are shorted, the FUSE stops the fire. and flames.
we fix this buy isolating the shorted part.
we do that with an ammeter. (there are other ways, ask)
i see the ammeter prove short then
i try each door manually , 1 by one form the local door switch lock
to see if one door blows the fuse when activated.
BINGO, so then unplug that door lock solenoid, still blow the fuse
(i use a fuse substitute device (sold in all good auto-stores) called a fuse, circuit breaker converter)
lock sol, removed, still blows?, yes? then harness shorts, (hard work)
if Sol, pulled cures over-current, its bad. a shorted soleniod.

there are other ways, ill just list them.
no ammeter?
no C-Breaker.?
  1. use a light bulb in place of fuse. (i use a head light in a box)
  2. a current limited power supply in place of fuse. (see over current)
  3. Pul all parts, 1 by one on this bad line and a box of fuses.
there are 4 ways.
I always use an amp clamp meter on the line
and the circuit breaker trick.
then pull parts. and conn. on the bad feed. (lots there are)

that's it, for shorts.

Mar 09, 2014 | Jeep Liberty Cars & Trucks

1 Answer

MY 1991 ACURA INTEGRA 50 AMP FUSE UNDER HOOD KEEPS BLOWING OUT WITHOUT THE KEY BEING ON...... WHERE IS THE SHORT ? WHERE DO I START LOOKING/?


50amp only clue and you dont have the book, the FSM.
nor access to alldata.com?
if you did youd, not be asking right?
my guess is that fuse is in the mains box under hood..
and is a real fuse and not a circuit breaker found elsewhere....????
old car, and can be anything this old.
sounds like fuse #33 in the main box blew. and feeds the white wire main.
USA car? ABS opted? A/C opted. sure.
top cause, shorted alternator, so take off that big wire from alternator
and see if fuse blows now. (do so with battery neg lug removed
the remove alt big wire and tape it all up, so it can touch metal.
then put back battery Neg lug, and last the fuse.

the whtte feed goes vast places and runs whole sections of
the cab fuse boxes and power windows.

if the Alt is good.
then you must start dropping all white wire loads.
if it still blows, the harness is shorted.
I personally just uses a temporary circuit breaker in place of the
50 amp to find the short and an ampclamp DC ammeter.
fast.
login to alldata.com and follow the big white wire.

Sep 17, 2013 | Acura Cars & Trucks

1 Answer

Tail lights wont come on keeps blowing fuse blows 10 amp 15 amp and even 5 amp fuses


put a 12 volt light bulb in place of the fuse. It will stay lit until you find the short circuit. Check tail and park light & side marker bulbs first.

How about if you just turn parking lights on, not headligths

Oct 11, 2011 | 2001 Ford Focus

1 Answer

Only my Battery fuse is going out and i keep replacing them but whenever i put the ground wire back on the battery the fuse gets blow out agian


Are you talking about fuse # 15 in the Power Distribution Center under the hood? The 70 Amp fuse?

There are only a few things that can make this fuse blow:

1. The battery is installed backwards
2. There is a short to ground in the alternator or the battery cable that goes to the alternator
3. A defective/shorted Electrical Load Detector Unit (ELD)

I guess you have allready found out, so I don't need to preach to you about how replacing a fuse without FINDING and CORRECTING the REASON it blew, will only cause another innocent little fuse to have to give up its life to keep your vehicle from burning to the ground!

Aug 07, 2011 | 1990 Honda Accord

1 Answer

I have a 1992 toyota paseo have changed the fuel pump and the fuel relay and it is still blowing the 15 amp fuse for the ignigtion can figure out why. thnx for the help


You may have a blown ignition module or a short at the coil, that's where this circuit goes. What I like to do when I run into a instantly blowing fuse, is wire in a headlight bulb to where the fuse normally is. A headlight has pretty low resistance so if you wire it in place of the fuse, it will pass enough current to operate most things that the fuse is there to protect if there was no short. With the bulb in place, you can go around the car wiggling wires and unplugging devices until you see the headlight go out, that means you have removed the short circuit and likely found what is blowing the fuse.

Mar 03, 2011 | 1992 Toyota Paseo

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