blowing fuse

Author Topic: blowing fuse  (Read 1075 times)

Offline 72rtchallenger

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blowing fuse
« on: August 01, 2015 - 08:12:28 am »
Recently have been trying to hook up marker lights on front of car (70 style challenger) and keep blowing the 20amp fuse ,  its on the passenger side fender as if you have it out holding in hand and plugged up it works great but if mounted the lights get dim and blows the fuse , also have seen it ark a little if I touch the housing to the body while turned on , and the signal light on valance on the same side can be dim some times and flickers a little getting brighter to dim and also when using signals left or right side the opposite side signal  flickers a little also , not alot but I can notice . I am leaning toward its a grounding issue as the chassis and engine  ground strap is missing but was wondering if any one has any thoughts or other ideas, as the blowing fuse throws me off some, and no short in the wiring that I can find , have ordered a ground strap just waiting on it . An haven't done the amp meter bypass  or anything , have been thinking of doing it but haven't yet . Any thoughts ?
72rtchallenger
my challengers restro at http://www.cardomain.com/ride/399010
what happens in the garage
stays in the garage




Offline js29no

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Re: blowing fuse
« Reply #1 on: August 01, 2015 - 08:19:34 am »
a dim light = bad ground. blowing fuse = dead short or power finding a ground.

Online 1 Wild R/T

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Re: blowing fuse
« Reply #2 on: August 01, 2015 - 12:22:56 pm »
Pull the bulb & make sure it's a double filament bulb...
JS27N0B 70 Challenger R/T Convertible  FJ5 Sublime, Show Poodle w/90,000 miles since resto
WS27L8G 68 Coronet R/T Convertible  PP1 Bright Red, Project
RM21H9E 69 Road Runner Coupe R4 Performance Red, Sold...
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Offline 72rtchallenger

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Re: blowing fuse
« Reply #3 on: August 02, 2015 - 08:58:37 am »
The marker lights do not blink and do not require a double filament bulb but I am going to pull them to  make sure they are the correct ones , its not a dead short have checked at least not under the hood, but I will check again as I may have missed something  , its strange as the fuse doesn't blow immediately but doesn't take long , and its only the passenger side marker giving me issue as all 3 other marker lights are fine until I try to install the 4th then all 4 dim and slowly the fuse blows , have traced the wiring once from that side and could not find anything and it works fine with the marker not mounted to the fender  while holding it in my hand , its only when mounted that this occurs
72rtchallenger
my challengers restro at http://www.cardomain.com/ride/399010
what happens in the garage
stays in the garage

Offline 72rtchallenger

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Re: blowing fuse
« Reply #4 on: August 02, 2015 - 09:45:33 am »
Does anyone know the correct bulb size for 70 challenger marker light ?
72rtchallenger
my challengers restro at http://www.cardomain.com/ride/399010
what happens in the garage
stays in the garage

Online 1 Wild R/T

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Re: blowing fuse
« Reply #5 on: August 02, 2015 - 10:19:24 am »
Front takes a 194, Now that I see your talking about the marker light your correct no double filament, it sounds like the power wire going the the bulb is chaffed....
JS27N0B 70 Challenger R/T Convertible  FJ5 Sublime, Show Poodle w/90,000 miles since resto
WS27L8G 68 Coronet R/T Convertible  PP1 Bright Red, Project
RM21H9E 69 Road Runner Coupe R4 Performance Red, Sold...
5H21C  65 Falcon 2 dr Wagon... Dog Hauler...

Offline 72rtchallenger

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Re: blowing fuse
« Reply #6 on: August 02, 2015 - 10:23:44 am »
 looking at power wires haven't found anything yet , have discovered about 10 volts on both front marker light housing but only passenger side causes me the issue which is still got me puzzled , also I dont think the 194 is correct bulb as I think those are  just push in type bulb like on the 72 to 74 marker lights if I pulled up the right info on a search , this one is a twist in bulb , I have put in the #1893 but it may be that I need the #1895 but am unsure
« Last Edit: August 02, 2015 - 11:04:59 am by 72rtchallenger »
72rtchallenger
my challengers restro at http://www.cardomain.com/ride/399010
what happens in the garage
stays in the garage

Offline 72rtchallenger

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Re: blowing fuse
« Reply #7 on: August 02, 2015 - 10:51:20 am »
found the source of the 10 volts on housings , the pig tail on the wiring harness side had been replaced and the wires were switched , so problem solved
72rtchallenger
my challengers restro at http://www.cardomain.com/ride/399010
what happens in the garage
stays in the garage

Offline Roadrunner420

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Re: blowing fuse
« Reply #8 on: December 23, 2017 - 01:30:49 pm »
Thank you for posting this fix on this thread- had the exact thing- it would have taken me forever to figure out why I kept blowing fuses-  yep passenger side marker light wiring was reversed!!😊


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