Hello The Starter Relay comes with a battery clamp, for the positive terminal, a long fat wire, to the Starter terminal and 2 thin wires. One of the thin wires is the main live feed to the van and the other goes to earth via the ignition switch and starter button.
If you look carefully at the relay you should be able to work out which is which, or test with a bulb. On my van the 2 thin wires that attach to the Starter relay assembly run off in the direction of the Accelerator pedal.
The Indicator relay seems to be located in the switch housing. I thought mine was not working but it needs the current to be drawn by both bulbs to operate so they all need to have very good connections and very, very good earths. Everyone of the earths on all rear light assemblies, Indicator, stop and tail our van were poor.
My suggestion would be to start with the light units first. This site :
http://www.autoelectricsupplies.co.uk/product_list/81" onclick="window.open(this.href);return false; has cheap repair bulb holders to refurbish your old lights so you won't need to spend a lot of money on replacements. Note that the site has cheap replacement headlights but we have not checked if they fit the HY.
As to the rest of the wiring, if you go on our website :
http://www.citroenhyonline.co.uk/" onclick="window.open(this.href);return false; and use the contact page to email us with the details of what you need, I will take photos of our van.