sean f connaughton Posted July 20, 2020 Report Share Posted July 20, 2020 Hi I have no overdrive so i tightened the loose spade connections to relay put the car in 4th gear i moved the stalk and i could hear the relay clicking. Great i went out for a quick spin to check that the problem was solved. no joy. Back home i again i tested the relay and it was clicking away. now i need help as i don't know if i put back the spades in the correct position. Is there a colour code ? any help would be appreciated. thanks . Sean. Quote Link to post Share on other sites
Drewmotty Posted July 20, 2020 Report Share Posted July 20, 2020 The relay is. clicking but is the solenoid on the overdrive clicking? Quote Link to post Share on other sites
RogerH Posted July 20, 2020 Report Share Posted July 20, 2020 Hi Sean, have a look here http://www.advanceautowire.com/tr24a.pdf Basically white (ignition) to W1 Yellow/Green to W2 Brown to C1 Yellow/Purple to C2 Roger Quote Link to post Share on other sites
ctc77965o Posted July 20, 2020 Report Share Posted July 20, 2020 Sean, could be a bad relay. Repeat your experiement & after the click reach down to the relay and waggle the C1 or C2 terminals...if you hear a much deepr click then thats the overdrive solenoid coming in...and proves the contacts of your relay are dirty.....time to replace relay. Quote Link to post Share on other sites
ianc Posted July 21, 2020 Report Share Posted July 21, 2020 The relay feeding the overdrive solenoid has to work hard as it's feeding an inductive load. Eventually, the contact in the relay gets knackered and although it may click, it may not be supplying power to the solenoid. My TR4 has eaten about 3 relays in the past 27 years (the overdrive gets a lot of use in 2nd, 3rd & 4th). Ian Cornish Quote Link to post Share on other sites
tthomson Posted July 21, 2020 Report Share Posted July 21, 2020 1 hour ago, ianc said: The relay feeding the overdrive solenoid has to work hard as it's feeding an inductive load. Eventually, the contact in the relay gets knackered and although it may click, it may not be supplying power to the solenoid. My TR4 has eaten about 3 relays in the past 27 years (the overdrive gets a lot of use in 2nd, 3rd & 4th). Ian Cornish One option to help reduce contact wear is to put a diode between C2 and C1 so that it is reverse biased in normal operation, but shorts the connections when the relay opens. The ubiquitous 1N4007 is a suitable diode to use. TT Quote Link to post Share on other sites
james christie Posted July 21, 2020 Report Share Posted July 21, 2020 The original relay can become unreliable after time (50 years in my case according to the inscription) and although you hear the click it may work intermittently. I changed mine for a modern one given the price difference. It doesn’t look the part but functions ok. james Quote Link to post Share on other sites
Bobble Posted July 22, 2020 Report Share Posted July 22, 2020 Sean I posted the following response when this topic appeared earlier. Worth a try? This may be a long shot but I experienced the same problem earlier this year. Having tried all the usual "fixes" I had it looked at by an auto electrician. To cut a long story short the problem turned out to be dirty connections at the back of the ammeter. If I remember correctly power was reduced as a result and despite occasionally working the usual result was a click but no engagement. The ammeter was removed, terminals cleaned and reconnected resulting in no further problems. As stated this may not be a "normal" problem but it would be a cheap and simple option before embarking on a more expensive solution. Worth a try? Bob Quote Link to post Share on other sites
sean f connaughton Posted July 25, 2020 Author Report Share Posted July 25, 2020 Thanks guys really appreciate that .on my way to motor factors for bits and pieces. Sean. Quote Link to post Share on other sites
sean f connaughton Posted August 14, 2020 Author Report Share Posted August 14, 2020 Hi again. Still trouble shooting as i did not get to continue to fix the the problem last time. I went back to today to discover that i was looking at a relay thats over R H side of trottle . . When i disconnected it i could hear clicking noise over the the clutch pedal ( I was wondering what this other over trottle relay is for? ) i have located the relay and hope to fix it this weekend. Sean. Quote Link to post Share on other sites
Malbaby Posted August 14, 2020 Report Share Posted August 14, 2020 I would initially fit a modern relay and go from there. Quote Link to post Share on other sites
sean f connaughton Posted August 15, 2020 Author Report Share Posted August 15, 2020 i have found that the relay on the left of the clutch is the overdrive one, but i am puzzled as to what the one on the right of the accelerator pedai is ?? Quote Link to post Share on other sites
peejay4A Posted August 15, 2020 Report Share Posted August 15, 2020 Indicator flasher unit. Quote Link to post Share on other sites
RogerH Posted August 15, 2020 Report Share Posted August 15, 2020 Voltage regulator for the Fuel & Temp gauges Roger Quote Link to post Share on other sites
peejay4A Posted August 15, 2020 Report Share Posted August 15, 2020 +1. Ignore mine. Quote Link to post Share on other sites
sean f connaughton Posted August 15, 2020 Author Report Share Posted August 15, 2020 Update. Fitted a modern relay this morning had a louder click and road tested. The overdrive is now working . Thanks everybody for all your responses. Sean. Quote Link to post Share on other sites
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