Ok, I had a bit of time on my hands recently and was wanting to tidy up the wiring on my D1. My Garmin 1000 is only a couple of cms away from the Igaro so the wire to the female USB socket and the shortest of micro USB leads is an order of magnitude too long. In an attempt to tidy this up I chopped off the USB socket approximately half way between socket and capacitor, I then made a new micro USB lead by soldering the internals of a spare micro USB plug to the wires from the Igaro and used some Sugru to make a new casing/insulation for the plug.
So far so good, looks loads neater and the wire is still long enough to reach to anything I'm likely to charge.
While it works fine when up to speed, the problem I've now got is that intermediate speed performance with my Garmin 1000 is problematic; charge is not stable either on or off, it now fluctuates quickly on/off/on/off. What have I done? have I unwittingly reduced the capacitance of the system slightly? I've still got the stock capacitor in the loop, I didn't touch that, but did the socket and extra cable add any extra capacitance that I've now removed??
What have you done with the data lines on the micro-USB plug? Is it the same as what the Igaro's USB socket does with the data lines? This is how dumb chargers are identified, and I expect it may affect the Garmin's behaviour.
I think you are seeing the same behaviour Andrew and myself pointed to a week ago, I haven't chopped or rewired my USB, but I seem to recall before the recent V4 garmin updates, the Edge 1000 would just beep once and say, external power lost. and then at an appropriate time & speed would beep again and say, external power back on. Behaviour now appears to be beep beep beep beep.... as it flicks between power there, power not there.
So for me, this is either someway has changed on the Garmin about how they deal with the power being present or, something has failed on the D1 (capacitor?)
I'm erring on the Garmin induced version as it seemed to work OK before, and I noticed Andrew's Garmin doing the chirpy chirpy song when we slowed down on The Shark's hills so. With the Luxus U, this is managed by there being a small battery in the lamp which fills in for a short period of time the power dropping from speed reduction. Present work around suggested is to use a power bank, preferably one with pass-through charging.
igarocom have stated they are looking at a potential solution using large capacitors to provide a reservoir like option to fill in the gaps...