Starter clicking and head lights on.
Several months ago I purchased from a dealer, cheaply, (E39 2000 523i 80000 miles)the vehicle was running but had the head gasket changed twice to try to cure oil in the water, neither operations cured the problem hence the cheap price.
The car started and ran (after some work that the forum has already assisted me with).
I purchased a doner engine stripped the engine down and replaced any parts that were required I also stripped and cleaned the starter and tested it before refitting.
I refitted the engine and made sure the battery was fully charged, today I attempted to start the engine, on turning the key all the lights came on, on the dash but the starter did not turn the engine it just clicked and continued to click at about two second intervals, half the lights on the display went out and the headlights, side lights and flashers illuminated.
Thinking I had a battery problem I connected up an emergency battery pack to the battery this made no difference.
It is worth noting that when attempting this start the interior lights do not dim as you would expect with a bad battery, the earth from engine to frame is connected and making good contact.
Any assistance would be greatly appreciated.