keithm Posted July 20, 2020 Report Share Posted July 20, 2020 Hello The wiring diagram (Advance Autowire) and (Haynes not so clear) show instrument lighting for 8 instruments - I have only 6 -Oil, Fuel, Temp, Ammeter, Speedo & Tacho on my 4a. Are the diagrams wrong or am I missing something? Thanks Keith Quote Link to post Share on other sites
Drewmotty Posted July 20, 2020 Report Share Posted July 20, 2020 Two bulbs each in speedo and rev counter. Quote Link to post Share on other sites
tthomson Posted July 21, 2020 Report Share Posted July 21, 2020 Hi Keith, You are correct that there should be six bulbs; one for each instrument. Usually there is only one bulb in Tacho and Speedo on a TR4A. Often diagrams have errors, but use a mirror and a torch to look behind the dash for confirmation. TT Quote Link to post Share on other sites
Ocheye Posted July 23, 2020 Report Share Posted July 23, 2020 There are also the ignition warning lamp and main beam lamp to consider. Maybe they are included in the 8 Andy Quote Link to post Share on other sites
tthomson Posted July 24, 2020 Report Share Posted July 24, 2020 (edited) 23 hours ago, Ocheye said: There are also the ignition warning lamp and main beam lamp to consider. Maybe they are included in the 8 Andy They should not be on the same wire as the panel lamps, and the ignition warning lamp has a different bulb holder. I have attached the wiring diagram that I created for my TR4A's wiring after converting it to use an alternator, which may help. (I found other diagrams were not necessarily correct and some were downright confusing). TR4A_wiring.pdf Edited July 24, 2020 by tthomson Quote Link to post Share on other sites
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