about jumper wires

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6 years 2 months ago #18083 by Sako
about jumper wires was created by Sako
hey!
I was just watching the video about testing the fuel pump circuit, Paul mentioned that we could energize the fuel pump manually by jumping the load side of a fuel pump relay using a fused jumper wire. my question is, what sized fuse I need to use? how do you guys calculate that?

I tried to search the forum to see if someone else have posted this question before, but I couldn't find any.

thanks

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6 years 2 months ago #18085 by Chad
Replied by Chad on topic about jumper wires
Fuel pumps, usually, run under 10 amps.

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."

I have learned more by being wrong, than I have by being right. :-)

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6 years 2 months ago #18086 by Sako
Replied by Sako on topic about jumper wires
thank you :)
but in general, how can I calculate the size of the fuse that i need to use to jump different components?

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6 years 2 months ago - 6 years 2 months ago #18087 by Chad
Replied by Chad on topic about jumper wires
Ohm's Law:
I=V\R
Or
Amps=Volts/Resistance

en.wikipedia.org/wiki/Ohm%27s_law

This is my favorite visual:


"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."

I have learned more by being wrong, than I have by being right. :-)
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Last edit: 6 years 2 months ago by Chad.

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6 years 2 months ago #18088 by Sako
Replied by Sako on topic about jumper wires
I is the size of fuse i need (current)
V in our case is battery voltage
R is resistanse, what number to put here?

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6 years 2 months ago #18091 by Chad
Replied by Chad on topic about jumper wires

Sako wrote: R is resistanse, what number to put here?


The total resistance of the component(s)/circuit in question, measured in ohms.

Disconnect/Remove all voltage from the circuit. With a multi-meter set to OHMs/Resistance, touch one lead to the power wire, and touch the other to the ground wire. Read the resistance. A "K" indicates KILO-ohms (ohm x 1,000). An "M" indicates MEGA-ohms (ohm x 1,000,000). OL Mega-ohms indicates an open circuit.

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."

I have learned more by being wrong, than I have by being right. :-)
The following user(s) said Thank You: Noah

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6 years 2 months ago #18092 by Chad
Replied by Chad on topic about jumper wires

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."

I have learned more by being wrong, than I have by being right. :-)

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6 years 2 months ago #18093 by Sako
Replied by Sako on topic about jumper wires
ahaa I see, thank you so much :D

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6 years 2 months ago #18146 by Tutti57
Replied by Tutti57 on topic Re:about jumper wires
Would you be able to check the fuse in the circuit and use one with the same rating?

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6 years 2 months ago #18147 by Chad
Replied by Chad on topic Re:about jumper wires
Yes.

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."

I have learned more by being wrong, than I have by being right. :-)

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6 years 2 months ago #18149 by rockp2
Replied by rockp2 on topic Re:about jumper wires

Tutti57 wrote: Would you be able to check the fuse in the circuit and use one with the same rating?

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That was my thought. Work smart, not hard. :)

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6 years 2 months ago #18325 by padroo
Replied by padroo on topic about jumper wires
You can do the math but the simple answer is the fuse is there to protect the wire.

If the fuel pump circuit has say a 10 Amp fuse in it the manufacturer chose a 10 Amp fuse then you should use the same. It will protect the

wire and if it burns open it is doing it's job protecting the wire to the fuel pump.

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