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41
Wedge List / Postscript to side marker bulb holders
« Last post by "Jim Altman" on October 12, 2017, 08:59:19 AM »
John Craddock in England has the bulb holder part number in stock and they

actually fit.  A few pounds a piece plus a few pounds shipping. Thanks to

all for ideas and substitutes.  On to my alternator replacement.  Saturn

alternator on hand, clocked, awaiting pigtail for connections.



 



 



Jim Altman



jaltman636@gmail.com



 

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Archives provided courtesy  http://www.triumphwedgeowners.org
42
Wedge List / Re: Re: TR7 No Cranking Problem
« Last post by Greg Gall on October 09, 2017, 11:08:27 AM »
I can confirm that the TR7 requires the special starter relay...







Years ago I bought a dead 1977 TR7 and it had no power to the ignition system. I found that the beureka wireb (resistive wire) which acted as a ballast wire to power the coil was fried. The moment I patched it and turned the ignition to ON (not START), the car started turning over and the eureka wire started smoking!







Turns out that the previous owner had replaced the starter relay with a normal Bosch relay and now the coil positive was electrically connected to the starter solenoid!







So I recall that the TR7 starter relay also functioned to bypass the eureka wire (ballast resistor) only when the key was in the START position (hotter spark during starting the car). Using a regular relay forced power to flow from the positive side of the coil to the starter solenoid, which activated the starter as soon as the ignition was ON and fried the eureka wire within probably a minute! Since the eureka wire runs through the dash wiring harness, you would have to pull the dash to repair it and there is a high probability that other wires will be damaged as well.







So the moral of the story is DO NOT replace the starter relay with a standard one, at least on a TR7!







Incidentally, I have owned a couple TR7bs (besides this b77) with failing starter relays. As Dave says, there is a big inductive load that tends to arc across the contacts. One car I carefully opened the relay and cleaned the contacts (they were rather burnt looking) and the other I just kept a screwdriver in the glove box and would hit it the relay with the handle any time it acted up... :)







Greg



Calgary







>
43
Wedge List / Re: TR7 No Cranking Problem
« Last post by kddpowercentre on October 09, 2017, 10:18:26 AM »
If it is the starter, hit it with with a hammer, relocates offending

item and normally works.





Brian



77 TR7 4sp



77 TR7 5sp

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Archives provided courtesy  http://www.triumphwedgeowners.org
44
Wedge List / Re: TR7 No Cranking Problem
« Last post by Dave on October 09, 2017, 07:30:42 AM »
I may very well be the starter.  But a starter costs $200 and changing it out means fiddling with the exhaust system and if I went through all that just to find out it was the starter relay I would kick myself.  (BTDT)  That is why I recommend checking out the transmission interlock jumper and starter relay first.  These are a lot less expensive and a lot less work.





 Check the easy stuff first.



 



Dave Massey
45
Wedge List / Re: Re: TR7 No Cranking Problem
« Last post by Dave on October 09, 2017, 07:25:37 AM »
I noticed that, too.  However, when I pulled my TR7 manual and looked there both are used.  One contact is for the starter solenoid and the other is used to light up the brake warning lights.  The TR8 key switch has a special contact used expressly for the latter and the other contact goes unused.



What is not clear on the diagram is which contact is used for the starter.  If it is the contact in the same position as the NO contact on the standard Form C relay they you can use one of those but if it is the other contact you can't.  For that reason I cannot recommend using the standard Form C relay without further investigation.  And that is for the TR8.  The TR7 REQUIRES the special relay.



 



 



Dave Massey
46
Wedge List / Re: TR7 No Cranking Problem
« Last post by kddpowercentre on October 09, 2017, 04:47:18 AM »
Had the same problem in the late 1990's, turned out to be mechanical not

electrical.



The starter motor solenoid centre bit that operates the contacts and

pulls in the pinion, slides in a thin wall brass tube. Now with engine

vibration over 20 years, it hammered a dent in the tube, stopping the

shuttle from moving, thus no operation, no noise and random operation.



Brian



77 TR7 4sp



77 TR7 5sp
47
Wedge List / Re: Re: TR7 No Cranking Problem
« Last post by "Jim Altman" on October 08, 2017, 10:33:54 PM »
Looking at the schematics, that second terminal on the relay where all three

are connected together is only in use on the FI cars (as to TR8's, didn't

check TR7 schematics), so it should work with a "normal" relay for the

carb'ed cars.





Jim Altman

jaltman636@gmail.com
48
Wedge List / Re: TR7 No Cranking Problem
« Last post by dave1massey on October 08, 2017, 08:09:29 PM »
That makes sense.B  That contact carries the solenoid current and that is an inductive load so each time you release the key there is an arc across the contacts.B  Over the years the contacts burn up and stop carrying current.Easy fix if you have a spare relay.Dave MasseyB Sent from my Verizon, Samsung Galaxy smartphone---
49
Wedge List / Re: TR7 No Cranking Problem
« Last post by "Jim Morrison" on October 08, 2017, 07:55:36 PM »
I can't help chiming in here. A couple of days before heading to Triumphfest inFlagstaff,  my '79 TR7 started doing almostexactly what William described.  I'd turn the key- dash lights would come on but no starter.Perhaps on the second or third turn of the key -it would start right up.  There would be nohesitancy or slow turning of the starter, itturned over just like it should have.  It seemedinfrequent and intermittent at first.  I decidedto wait and see if it would get worse.  At Triumphest - after the first autocross  - itquit - wouldn't start, not to mention a crap loadof other issues which I couldn't touch 'cause thebloody car wouldn't start.  After much effort - lots of advice - I was told ofthe harness jumper wire for the Auto Tranny - forthe Neutral Safety start switch.  Since wecouldn't get under the car - my coaches had meopen the fuse panel up and pull the starter relayharness out to where I could see the wires withthe thought of putting a jumper wire between thetwo white / red striped wires.  Before I did this, I noticed I had a spare starterrelay in the glove box.  I pulled the old relayout and the new one in - and voila -  it startedright up.  STARTER RELAY.  The old one would even click, it just wasn't doingwhat it was supposed to be doing.  I was lucky tohave a new one on hand.  Guess that's why Icarried it with me.  Don't overlook the relay - check it first. Jim Morrison
50
Wedge List / Re: Re: TR7 No Cranking Problem
« Last post by dave1massey on October 08, 2017, 05:07:59 PM »
True.B  If you have some wire, terminals and crimpers.B  I got all that but not everyone does.









Sent from my Verizon, Samsung Galaxy smartphone

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