The 'E' Type Forum

It was a wiring error. The wire connected to the coil was on the accessories terminal which is isolated during cranking. This meant that there was a 12v connection to the coil when in position 2 on the switch (ignition on) but when turning to position 3 (start) the 12v feed to coil was turned off. F...

Hi Chris...Great that your up and running....so if I'm reading this correct in all the time you have had the car it's never fired whilst cranking...but only fired as you released the key.....obviously becoming more noticeable with the flatter battery....Steve I never really thought about it or noti...

its fixed! problem was that the coil feed was attached to terminal 4 (5) which is isolated during starting. Its been wired this way for 15years and was starting because of the momentum of the spinning engine firing when key released and 12v to coil restored. Te reason I had to attach a direct feed t...

https://i.postimg.cc/rpjnqBTk/20240627-083958.jpg This is a diagram for a S2 shows standard switch and connections for the Britex lock which i think your car has...Steve Thank you for that, its really strange because if I wired my switch up as the diagram shows there is no way the car would start b...

Last night I decided to re-test the ignition switch that was in my car when I bought it 15 years ago. Lucas 39679A. I noticed it has what looks like a manufacturing date of 44th week 1970, which given my car's build date of 5/6/69 suggests it is not the original one. I tested continuity across the n...

...If this is the case then either the battery or the starter motor or, (unlikely) both, is failing. If the battery has enough energy to crank the engine, then it is hardly failing. The coil is unballasted during cranking, so ought to have plenty of time and voltage to recharge at 120rpm. Clearly t...

It shouldn't be difficult...your car starts with a direct 12v to the coil......so when cranking why is there no 12v at the coil...what ignition switch replacement have you fitted..in a previous post you mentioned a 39415 Lucas..... Steve Yes, I fitted a 39415 switch which is effectively the same as...

abowie wrote: ↑

Mon Jun 24, 2024 11:53 pm

Is there a relay in your circuit, as in this diagram? If so there's a few other places to look.

Yes there is a relay located on splash panel near battery but its an earlier car with no ballast resistor.

If it starts as you release the key then it sounds like the switch wiring is wrong...I think from your previous post that you fitted a non standard/aftermarket switch...with the key in the position to operate the solonoid and turn the starter it should also be providing 12v to the coil. Steve That ...

Thanks for the suggestion Andrew - no I have not and I can try that at the weekend however the original ignition switch has never been touched previously in the 15 years since I have owned the car, and both it and the OEM Lucas replacement tested identically with my multi meter on the bench, so am s...

Hi all S2 FHC UK spec - will only start from cold with a wire connected direct from battery to coil. In this condition it starts easily. With no direct connection to coil it just cranks without any sign of firing Once warm it will start without the battery connected to coil, but only when you releas...

Symptoms - takes a while to start from cold with choke but once warm will restart immediately just using the key and no throttle - idles at 700rpm but feels and sounds lumpy. When I put my hands over the exhaust pipes the sound from the RH pipe is a nice quiet even humming sound whereas from LH pipe...

I don't think it will be incorrect wiring to the connectors as I have had the car for 17 years and it was working fine for the last 16.5 :bigrin: I'm assuming that there is an internal problem with the switch that is shorting out 12v feed to coil when starter operated. have ordered a switch that I a...

Great thanks for the confirmation - I'm glad the failure of my switch was not a hair raising as yours! Yes, I have and it worked fine. I burnt the original one out 7 years ago by running an ecu through it. Too many amps for the switch. Discovered the problem when the barrier raised into the Channel ...

Yes steering lock is fine, the switch is not allowing 12v feed to coil when starter motor operated so need new switch - I understand switch is held in place with a single screw That looks like what I had to use to replace an old switch on my S2. However a bit of searching under the Lucas code can fi...

Its hard to determine precisely which Lucas switch was fitted originally to my 5 June 1969 build S2 with a Britax lock assembly but wondering if anyone has had success using a 39415 - it is listed as one of the switches used in S2 production but keen to hear some practical experience

Update Car is now started by attaching direct feed from battery to coil input. Once engine started and warm it will re start without the direct 12v feed but only does so as you stop cranking the starter. There is 12v measured at the coil without the additional direct feed when ignition is on. Sugges...

Hi there - its been a long while since I last posted and I’m hoping for some help - my 1969 UK spec FHC has no spark at the plugs and therefore won’t start and I would much appreciate some help. For various reasons the car has been cared for by a friend living 150 miles away for the last couple of y...

Great, that was perfect, all done. I suspect that the fell off because I lowered the jack too far, which seems to push the spring clips off......

Problem fixed. The water pump was in fact fine. It was that there was inadequate coolant in the system due to an air pocket. Turns out there was only 5 litres in the system out of the required 15. The problem started when I had a failed expansion tank cap which let out loads of coolant as steam. I w...