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Old 05-16-2019, 02:17 PM   #1
Jstock85
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circuit breaker install

Im wanting to install a circuit breaker on the wire powering my firewall fuse box. I have an pcm and a couple other accessories connected to the distribution block an I'd like to add power windows and locks to my truck and I know that will be unsafe to leave that wire unprotected. I have a 10 awg wire running from the battery to the distribution block. I'd also like to use the type of breaker with the reset button and the lever to use as a kill switch.

My question is what amp breaker should I get for my application?

Thanks
Jeff
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Old 05-16-2019, 02:25 PM   #2
rpmerf
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Re: circuit breaker install

Will need to know the year, make, model, and modification to the electrical system to have any sort of idea. On my 70, I have a 30 amp fuse on my battery and 20 amp fuse on the power to the fuse block. You are going to need a lot more than that on a newer vehicle.
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Old 05-16-2019, 02:57 PM   #3
Jstock85
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Re: circuit breaker install

85 chevy c10

4.8 vortec from a 2000 Silverado, with original th350 trans

No radio or AC as of now but plan to reinstall using existing wires. May install Cb radio still undecided
No electric fans and no plans to install as of now.

I am not having any electrical issues I want to protect the circuit. I did the headlight relay upgrade and connected the relays to the back of the alternator. I will eventually add another fuse block when I install the power locks and windows.
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Old 05-16-2019, 03:01 PM   #4
Jstock85
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Re: circuit breaker install

Fused the headlight relays with 20 amp fuses. My pcm is also fused with 20 amp fuse. I think a 30 amp breaker would be fine im just wanting to check my work.
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Old 05-17-2019, 06:17 AM   #5
rpmerf
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Re: circuit breaker install

I might go for a 40, just to be sure it doesn't blow during normal operation. Sounds like this is just a big wire, so you aren't protecting a device, just in case the wire shorts out, right?
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Old 05-17-2019, 10:18 AM   #6
Jstock85
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Re: circuit breaker install

The wire from the battery runs to a fire wall terminal block, from there I have 2 wires going out. 1 is for my vortec PCM and the other is for the main fire wall fuse block. I plan to add a alternative fuse block so I can add power locks and windows to the truck in the future. I was told yesterday I should go no higher than 60 amp and that should handle what I have and what I plan to add. Does that sound right?
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