Fuse block
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Tuned
Joined: Aug 2001
Posts: 266
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From: Jacksboro TN USA
Fuse block
In my hivoy, the prior owner put a metal butt connector in a switched spot that controls my heater blower, cab lights, signal lights and fuel pump. I'd like to correct this and put a fuse in it. Any thoughts on what size fuse I should use?
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
You would have to add together the Amp draw on all those items and get a fuse with just a tad higher rating. Off the top of my head I'd guess a 35 amp.
Fleet Mechanic
Joined: May 2001
Posts: 1,396
Likes: 4
From: Cupertino
The heater itself needs 10 amps.
The cab lights and signal lights need very little, a few amps.
You should run a separate wire from the switched panel to the fuel pump and fuse it per manufacturer's recommendations with an inline fuse.
Fuses protect wires, not stuff on wires. Do not put a 35 amp fuse on a 10 amp circuit, especially to a fuel pump.
The cab lights and signal lights need very little, a few amps.
You should run a separate wire from the switched panel to the fuel pump and fuse it per manufacturer's recommendations with an inline fuse.
Fuses protect wires, not stuff on wires. Do not put a 35 amp fuse on a 10 amp circuit, especially to a fuel pump.
Laughing Gas
Joined: Mar 2010
Posts: 1,028
Likes: 5
From: San Francisco East Bay
It sounds like the PO was trying to find a valid power source for the electric fuel pump (and missed) during a fuel pump upgrade.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
But I suppose all this is Moot Point. I think the fuel pump should have it's own curcuit,relay, and it's own fuse.
Laughing Gas
Joined: Mar 2010
Posts: 1,028
Likes: 5
From: San Francisco East Bay
Hey Thipdar. I was thinking just the oposite. Please help me understand. I thought having things used at different stages would actually be better. That way the chance of all parts in the curcuit on at the same time would be low. But with a fuse strong enough to protect the curcuit just in case they are. Which is why I suggested measuring the draw on all the items in the curcuit. And Cougarjohn warned of putting too high a fuse in the curcuit.
But I suppose all this is Moot Point. I think the fuel pump should have it's own curcuit,relay, and it's own fuse.
But I suppose all this is Moot Point. I think the fuel pump should have it's own curcuit,relay, and it's own fuse.
If you only needed a fuse for the circuit with the highest draw, there would only be one fuse in the Fuse Block.
You don't want Starter Motor current running through your radio, you'd be listening to "The Sounds of Silence" in fairly short order.
Different fuses protect different parts of the system. Given a mix of Fuel Pump, Dome Light, Heater Motor and turn signal circuits, a short in the turn signals could cause fuel starvation and kill the engine. Setting up multiple fuses prevents a failure in one subsystem from causing a failure in a different subsystem.
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