"Ignition On" wiring/signal

[Angrey]

Can one of the electrical geeks chime in?

I'd like to use the "ignition on" signal/wire that's currently feeding the fuel pump driver module but instead of one FPDM it'll be feeding like 5 branches (4 different pump modules and an electronic refulator).

When wiring up anything that's preferred to be "ignition on" like stereo components or plug in chargers, pumps, etc, the 12v+ signal doesn't really have any current or draw does it? It's simply a check with me signal before allowing power to the device (only if the ignition is on)

I think it'll be fine, just worried there will be some sort of issue with having so many devices connected to the same source wire

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[Angrey]

Okay,

After researching and more brain damage than I'd like, this is what I've found.

A typical 12v, 30 amp relay will draw about 150mA (75 ohm) on the magnetic that closes the connection and allow power through.

So that would mean that if I'm running 5 of them off the same accessory on wire, it would be drawing about an amp (roughly) of current.

I also learned that it only takes about half the spec voltage to activate the relay, so I'm hopeful that with 5 tapped or branched relays it's not going to have too much voltage drop or current to create problems.

 

[Jackson1320]

You should not have any problems. They do draw power but very very little. Just like you have found on your own

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