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fuse blowing
#1347528 Sat Feb 22 2020 11:24 PM
Joined: Feb 2020
Posts: 21
B
Bodini Offline OP
'Bolter
Hi folks. I have a beautiful 1951 3100 with all 12 volt wiring that has been fine for 3 years. Out of the blue my 30 amp headlight fuse is blowing out. I replaced it and headlights work fine. I turn lights off and try turn signals and they dont work now. I replaced turn signal fuses and now they work. I turn headlights on again and now fuse is blown again. Everything is nice, neat and tight. What am I missing here? This is almost as fun as getting used to Windows 10. Thanks for any help.
Bodini

Re: fuse blowing
Bodini #1347539 Sun Feb 23 2020 02:16 AM
Joined: Jan 2013
Posts: 2,021
'Bolter
Have you traces the wiring? Sounds like you have a short somewhere in the turn signal wiring.

Does it do it when you use both signals, or just one?

Chris

Re: fuse blowing
Bodini #1347540 Sun Feb 23 2020 02:31 AM
Joined: Feb 2004
Posts: 23,246
H
'Bolter
The headlights should not be fused in the first place- - - -they should be on a self-resetting circuit breaker. In a properly wired system, there should be no shared circuitry between the headlights and the turn signals, so either someone has made some massive mistakes when they wired your electrical system, and/or you have two problems happening at once. The most common place the headlight circuit develops problems is the dimmer switch- - - -it carries some heavy current and it's in a very hostile environment down there on the floorboard.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: fuse blowing
Bodini #1347543 Sun Feb 23 2020 02:57 AM
Joined: Sep 2001
Posts: 31,343
Bubba
"Out of the blue my 30 amp headlight fuse is blowing out."

Where is your headlight fuse located?

Are you using the original light switch?
1948-1953 light switch


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: fuse blowing
Bodini #1347554 Sun Feb 23 2020 04:20 AM
Joined: Feb 2020
Posts: 21
B
Bodini Offline OP
'Bolter
Well, maybe I'm not that smart after all. Maybe it's not a headlight fuse. Ignition works fine and truck starts right up but it's the 30 amp fuse in the middle of my fuse board that pops and then headlights/tailights don't work. She does have the original style headlight switch. The turn signal unit is one of those chrome units that strap onto the steering column. I'll take a look at the dimmer switch but she's a fair weather truck and if the roads wet she stays in the garage. Thanks for your responses.

Re: fuse blowing
Bodini #1347560 Sun Feb 23 2020 04:50 AM
Joined: Mar 2010
Posts: 9,848
5
'Bolter
The headlight switch has a breaker built into it.

Re: fuse blowing
Bodini #1347583 Sun Feb 23 2020 01:47 PM
Joined: Feb 2020
Posts: 21
B
Bodini Offline OP
'Bolter
Is there any way to check the dimmer switch other than clicking it and seeing if high and low work?

Re: fuse blowing
Bodini #1347608 Sun Feb 23 2020 06:30 PM
Joined: Feb 2004
Posts: 23,246
H
'Bolter
Inspect the wires that connect to the dimmer switch for looseness, brittle insulation, corrosion, etc. It appears that someone has misrouted the power wire tp your light switch- - - it should be connected directly to the ammeter, and the built-in circuit breaker in the light switch protects against shorts downstream of the light switch. In case there is an overload, the breaker is supposed to cycle on and off fairly quickly to avoid losing the headlights entirely. If the truck has had any kind of rewiring done, during an older restoration, maybe, it sounds like someone who didn't understand that principle wired the headlights through a fuse that also feeds other circuits. I'd suggest for starters that you wire a circuit directly to the light switch with a 30 amp circuit breaker in the supply line, not a fuse. That will take some load off the fuse that keeps blowing and also give you a safer way to protect the headlight wiring.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: fuse blowing
Bodini #1347614 Sun Feb 23 2020 06:54 PM
Joined: Jul 2000
Posts: 1,335
G
Insomniac
Have relays been installed in the headlamp circuit? IF so, that might be the source of the wiring error.


Gord
----
1954 1/2 ton 235 4 speed
Re: fuse blowing
Bodini #1347628 Sun Feb 23 2020 07:57 PM
Joined: Feb 2020
Posts: 21
B
Bodini Offline OP
'Bolter
I appreciate all your help very much. Hot Rod Lincoln, my Rebel wiring kit has a power wire straight to the light switch. Are you saying run that wire to the original (but 12 volt) gauge and then wire the switch off of the volt gauge?

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