Quote:
Originally Posted by Volvo_Utrecht
What you usually do is just add a wire to one of the three plugs (need to search which one) and connect that to the sender and a a bulb of course. I believe it is the middle connector position 9 which will be empty in your case.
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That's correct - the diode is there for two functions, one as a bulb test as it brings the other waring lamps on with the charge/alternator warning lamp and the other is to prevent back-feeds from the other warning lamps bringing the charge warning lamp on erroneously.
The low coolant warning lamp can be fitted without the diode but will not have a self-test function in conjunction with the charge and other warning lamps, however you can add a diode externally from the instrument cluster - cathode ("Bar" on the body) to alternator warning lamp wire and anode to the low coolant switch wire. Any 1N400x diode will do, a 1N4001 or 4007 is probably easiest to get hold of.
https://www.ebay.co.uk/itm/300423054353
Used that place many times, usually direct from their own site (spiratronics.com) but that is down for maintenance as i type.
Saves you soldering to the fragile PCB!
