E39 - K&N Filter

Features:
-Multiple functions: alternator state check, battery state
check, check before charge and overload display.
-6-LED display, clearly present the alternator and battery state.
-Two testing clips for safe and easy operation.
-Small size and light weight, convenient to carry.
-Fit car, motorcycle, etc., with 12V battery.

Specifications:
-LED quantity: 6 (2 red, 3 green and 1 yellow)
-Material of wire: 0.06square millimeter copper
-Max. voltage and current: 12V 15A
-Length of wire: 27cm / 10.6in
-Battery tester size: 12 * 5.2 * 1.8cm / 4.7 * 2 * 0.7in
-Battery tester weight: 67g / 2.4oz
-Package size: 25 * 14.5 * 2.5cm / 9.8 * 5.7 * 1in
-Package weight: 110g / 3.5oz

It is to say, "Why open the stable door when the horse has already bolted?", Well, yesterday these type of testers were on the expensive side within the UK, today it was much cheaper as an import: Ebay £3.43 (TomTop_Shop), Shen Zhen, China - It has only taken two weeks for delivery. This tester does the job in testing the condition of your battery and alternator, why pay any more?
This battery tester is safe and easy to operate, has multiple functions: - alternator state check, - battery state check, - check before charge and overload display, telling us the state of the alternator and battery, thereby helping to assess our driving safety.

Both batteries have remained charged and when tested with this tester has shown all the green lights. After cleaning the terminals on the alternator inside and out, refitting, (see diary) the charge seems ok on the OBC however, it is always good to check with a backup tool such as this tester, even if it has been weeks after the event, it allows one to compare results and move on to the next job. With fuse 4, re-inserted the monitor did show a drain as indicated by the 'middle' ambre light after twenty minutes. On taking the fuse out again and an engine re-start and then switching off again, the monitor indicated with green lights So, the re-routing of the live feed from Fuse 4 box to the washer pump is an option and is pending.To conclude, I can live without the interior lights for now, as long as the BM remains reliable, I will need the washers to work, this is required for safe driving and MOT, that is more important for me, so this job pending.