Vee's Indicator Circuit Volt-drops

Test Order	Test	Voltage				Diff	Note
1	Battery	11.9
1.1 if 2 bad	Solenoid stud
2	Fusebox brown	11.5				0.4
2.1 if 3 bad	Ignition switch multiplug brown	11.5				0
2.2 if 3 bad	Ignition switch multiplug brown	11.5				0
2.3 if 3 bad	Ignition switch brown
2.4 if 3 bad	Ignition switch white
2.5 if 3 bad	Ignition switch multiplug white	11.4				0.1
2.6 if 3 bad	Ignition switch multiplug white	11.4				0
2.7 if 3 bad	White from main to rear 1	11.25				0.15
2.8 if 3 bad	White from main to rear 2	11.17				0.08
3	Fusebox white spade	11				0.5
3.1 if 4 bad	Fusebox white fuse holder	11				0	1
3.2 if 4 bad	Fusebox white fuse endcap	10.97				0.03	1
3.3 if 4 bad	Fusebox green fuse endcap	10.92				0.05	1
3.4 if 4 bad	Fusebox green fuse holder	10.74				0.18	1
4	Fusebox green spade	10.71				0.29	1
4.1 if 5 bad	Green bullets behind dash (can be several)
4.2 if 5 bad	Hazard switch (where fitted) green 1	10.2				0.51	2b
4.3 if 5 bad	Hazard switch (where fitted) green 2	10				0.2
5	Flasher green linked to green/brown	10				0.71	2a
5.1 if 6 and 7 bad	Indicator switch multi-plug green/brown 1	9.7				0.3	3
5.2 if 6 and 7 bad	Indicator switch multi-plug green/brown 2	9.7				0
5.3 if 6 and 7 bad	Indicator switch green/brown
	Sides of car	Right	Left
5.4 if 6 and 7 bad	Indicator switch green/red and green/white
5.5 if 6 and 7 bad	Indicator switch multi-plug green/red and green/white 1	9.5	9.5			0.2
5.6 if 6 and 7 bad	Indicator switch multi-plug green/red and green/white 2	9.5	9.5			0
6	Green/red and green/white bullets from main by fusebox 1	9.48				0.52
7	Green/red and green/white bullets from main by fusebox 2	9.48				0
8	Green/red and green/white bullet to rear by fusebox	9.46	9.46			0.02
	Corners of car	RF	LF	RR	LR
9	Green/red and green/white to green 1	9.25	9.38	9.35	9.25	0.21
10	Green/red and green/white to green 2	9.14	9.34	9.35	9.25	0.11
	Earth tests
11	Bulb base	0.9	0.4	0.1	0.05	0
11.1 if 11 bad	Bulb holder	0.9	0.4	0.05	0	0
11.2 if 11 bad	Light unit base	0.9	0.4	0.05	0	0.886	4
11.3 if 11 bad	RB bullet by headlight 1	0.014	0.4			0
11.4 if 11 bad	RB bullet by headlight 2	0.014	0.2			0.014
12	RB body earth	0

Notes:

On the face of it a total volt-drop of 2.76 volts from the battery to the worst corner. However over the duration of the tests the battery dropped by 0.6v reducing this to 2.16. I used one meter permanently connected to the battery for convenience in periodically rechecking the battery voltage and another for the remainder of the tests. There is a 0.4v difference between the two meters, reducing this 'worst case' still further to 1.76. The 'best' corner showed a 1.52v drop on the same basis. The 'Diff' column is the point-to-point volt-drops, not the overall volt-drop to that point. These tests were done as a 'proof of concept', not because I had a problem with Vee's indicators. If your indicators are slow or not flashing at all you should expect to find a total volt drop greater than I show here.

If you get more than a couple of tenths volt-drop between the green spade and the white spade it's probably worth replacing the fusebox.
The bulk of the volt-drop between the green spade at the fuse box and the flasher unit (2a) is between the fuse box and the hazard switch (2b). There is a 4-way bullet connector in this green run, hidden somewhere behind the dash.
Just a short piece of wire between the flasher and the indicator switch multi-plug, so this is unaccountably high.
Almost 1v lost at the right front which turned out to be where the earth wire joins the light unit. A very crude arrangement where the conductor strands are pushed through a hollow rivet and turned back outside it, then the rivet is pushed into a spring clip on the light unit. This is exposed to all the water and dirt thrown forwards by the front wheel. Dismantling, cleaning conductors, rivet and clip and coating with Vaseline before reassembly, got this down to the same as the other side.

The remaining volt-drops are all very small, it's debatable whether cleaning those connections will make much of a difference. The 0.5v improvement in the right front didn't seem to make any noticeable difference to flashing speed. The biggest improvement in voltage after fixing any obvious bad connections would theoretically be obtained by installing an ignition relay between the brown and the white at the fuse box to take the bulk of the ignition load off the ignition switch and its multiplug, and the white bullets in the main harness by the fusebox. A simulation where I moved the fuse box brown wire to the white spade boosted the voltages throughout the circuit by about 0.5v, which hardly seems worth it.