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Author: Subject: Power Distribution Module Question
John Bonnett

posted on 23/5/21 at 11:57 AM Reply With Quote
Power Distribution Module Question

On the face of it, when wiring from scratch, a PDM is the way forward rendering fuses and relays obsolete and reducing the amount of cable. Motogadget do a nice unit for bikes for about a hundred quid but with insufficient inputs and outputs for a road car.

So a couple of questions.

Is there a suitable unit available for reasonable money? I'm talking sub £1k and preferably sub half that?

Has anyone on here used one?

Any comments please?

Thank you.

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adithorp

posted on 23/5/21 at 12:44 PM Reply With Quote
Seen the Motogadget one and wondered if using two is feasible. Alternative is Simtek https://www.bodylogicuk.com/index.php/2/ but not cheap.





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John Bonnett

posted on 23/5/21 at 02:39 PM Reply With Quote
Thank you Adi, interesting reading and definitely the future. Unfortunately, well outside my budget so it looks like I'll have to tread the traditional path of relays switches and loads of wire.
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coyoteboy

posted on 23/5/21 at 02:59 PM Reply With Quote
Funny isn't it. I keep thinking of making my own one of these, but there's one over-riding reason not to. On the road repairs. If your relay fails, or your fuse blows, you pop into Halfords and grab another, or ram a nail in it after some investigation. If your PDM fails (as I had on a Megane) - you're buggered, and sending it off for £100s of quids worth of repairs by a specialist.

It's mad. Old clicky, spade terminal parts with huge amounts of bulk, but still seem preferable over something small and reprogrammable!





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peter030371

posted on 23/5/21 at 05:22 PM Reply With Quote
I know AB Performance used the mo.unit blue to rewire a Caterham not long before they shut down. I always thought it looked about right for a kitcar. What do you need that it hasn't got?
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felix_kentish

posted on 27/9/21 at 04:15 PM Reply With Quote
I know this is a bit of an old thread but it is exactly what I'm looking for at the moment. I'm thinking of a hybrid of some kind with most controlled by this unit and a few relays for the high powered stuff. I'd love it all to be controlled by one PDU but the car ones with more channels seem stupid expensive.

I'm hoping all of my lighting can be powered by this motogadget mo.unit which should do away with flasher relays and give an alarm/immobiliser of sorts which I believe is an IVA requirement. All switch wires can be switched to ground with fine wires so no need to feed full current through switches which will save on heavier gauge wire.

The Motogadget has the following outputs:

Starter
Left turn signal
Right turn signal
Lo-beam
Hi-beam
Horn
Brakelight
Ignition
AUX1
AUX2

The starter looks like it is 30A so probably not beefy enough for a car starter but you could certainly use that to trigger a relay
Doesn't look like there is anything for sidelights but one of the aux channels can be used for that.
Fuel pump can be powered on by ECU via a relay too.
Fan can be controlled by ECU via a relay too.
ECU could be powered by the other aux channel or ignition channel.

Having never done this before, is there any glaringly obviously things I'm overlooking?

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big_wasa

posted on 27/9/21 at 04:44 PM Reply With Quote
I measured a Zetec starter solenoid at around 10a with a higher initial spike. So the 30a supply should be fine.

Iíve bought the motogadget M lock for 7 itís a nice toy.

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John Bonnett

posted on 27/9/21 at 05:30 PM Reply With Quote
This is something I'm really interested in but at the moment I'm out of my depth and would appreciate your experience. Buying two would give 20 channels which would provide enough circuits I would have thought. But just to take the windscreen wipers as an example normally there are two speeds and an intermittent which I believe is achieved with a timer relay. How can that be catered for by a PDM?

Apologies for my lack of knowledge and thank you in advance for help and advice.

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felix_kentish

posted on 27/9/21 at 09:01 PM Reply With Quote
This is new to me too so no experience. If I do make something of this route I'll get in touch and let you know but I'm not going to be using windscreen wipers as there'll be no windscreen.

From what I've seen on YouTube and what I've read in the manual, it looks like each channel is quite dedicated to its use so a second unit may not do what you'd like it to.

I haven't really looked too much into them yet but there is a place that do PDM's called hardwire-electronics. Just stumbled across them while googling wiper control on PDMs. There seems to be a lot more control with these, bit more expensive though.

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felix_kentish

posted on 11/10/21 at 10:40 AM Reply With Quote
I thought this link may be useful:

https://www.google.com/amp/s/www.nopower.one/motogadget-wiring/amp/

Looks like they're also using an MSD 4 way solid state relay block too which would deal with the higher current stuff.

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