Question about 2001 Triumph Triumph Thunderbird
T'bird 01. The radiator fan does not turn on while riding or during cool-down. I disconnected it and applied direct power to find it works OK, and there is no shorting between incoming power and earth. When the engine is a little hot, eg 2 hours highway then stop/start traffic on a hot day, the overheating dash lamp comes on and flashes in sync with the blinker dash lamp when I turn the blinkers on !!? Otherwise the overheating dash lamp doesn't come on at all.
I opened up the plastic-wrapped wiring assembly which goes from inside the headlight to the dash lamps. Inside there is a little sealed black box about 2x1x1cm with 4 leads, being (i) plain black single earth in, (ii) brown earth which connects with both a brown earth on headlight plug and other brown earths going to dash lamps, (iii) and yellow and white lead from headlight plug, (iv) a white & brown lead going to overheating indicator lamp on dash. There doesnt appear to be any shorts between blinker power leads and overheating lamp.
So, I'm wondering why the fan isn't coming on, and why the curious flashing lamp phenomenon?
Disconnect the two fan plugs leads from the fan sensor switch in the thermostat housing bridge the two plugs with a wire if the fan starts then you will need to replace the fan sensor switch if not the fan will need replacing ,as for the temp light flashing with the indicator light maybe because they share the same fuse and they could share a common earth as well?
Posted on Jan 03, 2009
To my knowledge on most designs of bike's electrical system, the overheat indicator lamp is independent of the radiator fan wiring. This light is triggered by a separate thermostat and is basically a sensor/indicator affair. On the otherhand, the radiator fan motor has multiple connections. On one end would be another thermostat to trigger the fan on, the other end would go to a relay/time delay device and is supplied by a fused wire from the IGN B+12. The function of the "relay/time delay device" is to perform the switching action plus to provide supply even when the bike is switch off hence, the fan would still work for a minute or so after engine shut down. Based on this, areas to check would be:
Posted on Nov 18, 2008
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Posted on Jan 02, 2017
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