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Discussion Starter · #1 ·
Hi All,
Dont see a dedicated electrical section so asking here. I've ordered a set of Hella 500FF's for the truck that are expected to be here Tuesday. Doing some preliminary recon to be able to install them next weekend and came up with a few questions.

In the fusebox in the engine bay there is a 30A fuse that according to the diagram reads SPARE shown here


Anyone know if this fuse is powered? Does it come on when the truck is turned on?

Also an additional question, where would I run wires into the cab through the firewall? Previous vehicles there was a rubber grommet that I would pierce a wire hanger through and run the wires but I dont see anything other than the where it looks like the main wire harness runs into the cab.

Thanks!
 

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Hi All,
Dont see a dedicated electrical section so asking here. I've ordered a set of Hella 500FF's for the truck that are expected to be here Tuesday. Doing some preliminary recon to be able to install them next weekend and came up with a few questions.

In the fusebox in the engine bay there is a 30A fuse that according to the diagram reads SPARE shown here


Anyone know if this fuse is powered? Does it come on when the truck is turned on?

Also an additional question, where would I run wires into the cab through the firewall? Previous vehicles there was a rubber grommet that I would pierce a wire hanger through and run the wires but I dont see anything other than the where it looks like the main wire harness runs into the cab.

Thanks!
Here is a suggestion that I have for you buddy. Why not grab a friend, give him a voltmeter and see if that fuse has electrical current running through that. That way, you are a 100% sure that there is electricity running through that fuse.::grin::
 

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There is a rubber boot on the driver side on the fire wall. It's right below the master cylinder for the brakes.

If you are looking for a switched constant source, the fuse in the glove box is easier to use with an add a fuse. That's what I used for my switched 12v on my switch

Sent from my XT1585 using Tapatalk
 

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Discussion Starter · #4 ·
Here is a suggestion that I have for you buddy. Why not grab a friend, give him a voltmeter and see if that fuse has electrical current running through that. That way, you are a 100% sure that there is electricity running through that fuse.::grin::
I have one that I let my dad borrow for a quad copter he's been working on before the left to go out of town. He doesnt remember where he put it or it would have been the first thing I'd have done lol.

There is a rubber boot on the driver side on the fire wall. It's right below the master cylinder for the brakes.

If you are looking for a switched constant source, the fuse in the glove box is easier to use with an add a fuse. That's what I used for my switched 12v on my switch

Sent from my XT1585 using Tapatalk
That thought did occur to me but I figured this this is high enough in amp's and seems like a spare so why not power the whole thing off of this, especially if its powered only when the truck is on.
 
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I have one that I let my dad borrow for a quad copter he's been working on before the left to go out of town. He doesnt remember where he put it or it would have been the first thing I'd have done lol.
I have one sitting around at home too lol hahaa::laugh::::grin::. The only problem is that the ancient 12v battery finally died and I am too lazy to go to a local radio shack to go and buy one lol.
 

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I did quite a bit of poking around with a voltmeter in the fusebox under the hood. I never was able to find a reliable ignition-controlled power source in there. Everything seemed to be always-hot or connected to headlights, cooling fans, or other critical functions.

I eventually opted to wire directly to the battery with a 40A relay controlled from the cab (was able to find numerous ignition-powered connections inside the cab). This way I don't have to worry about overloading a critical circuit and have plenty of power to run other accessories. Wires between the cab and firewall run through a rubber seal on the firewall under the master cylinder on the driver side.





 

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Discussion Starter · #7 ·
I did quite a bit of poking around with a voltmeter in the fusebox under the hood. I never was able to find a reliable ignition-controlled power source in there. Everything seemed to be always-hot or connected to headlights, cooling fans, or other critical functions.

I eventually opted to wire directly to the battery with a 40A relay controlled from the cab (was able to find numerous ignition-powered connections inside the cab). This way I don't have to worry about overloading a critical circuit and have plenty of power to run other accessories. Wires between the cab and firewall run through a rubber seal on the firewall under the master cylinder on the driver side.

http://www.indiweb.com/forumphotos/mods/power/powerdist.jpg

http://www.indiweb.com/forumphotos/mods/power/battterm.jpg

http://www.indiweb.com/forumphotos/mods/power/distblock.jpg
Hey, tanks man! you helped me out on a previous thread with wiring questions too. This is very helpful. I plan to use the harness and switch the lights come with for now and build out a better system as my need grows. Its on my list of things to do.

Can you elaborate on what you're doing with the 40A relay? The relay wont power on till the truck is on so the whole system doesnt draw power till the relay activates?
 

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Hey, tanks man! you helped me out on a previous thread with wiring questions too. This is very helpful. I plan to use the harness and switch the lights come with for now and build out a better system as my need grows. Its on my list of things to do.

Can you elaborate on what you're doing with the 40A relay? The relay wont power on till the truck is on so the whole system doesnt draw power till the relay activates?
The relay is powered on when the ignition is on (from fusebox under dash inside cab). When ignition is off, the relay is off and no power is passed through the contacts (essentially all is off).

In my case, I have one 8 gauge wire that passes directly to one of the junction blocks to power items I want available whether the ignition is on or off. The other 8 gauge wire passes through the relay contacts (when ignition is on) to power items I want to power down when the key is turned off... Think of the relay as a remote controlled switch. It is activated by a low current connection. When activated, it closes a set of contacts that allow high current to be passed through it.
 

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Discussion Starter · #9 ·
Thanks for clarifying geekmyride. Another question, do you know where the ground's are inside the engine bay and inside the cab by the fuse box?
 
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