Starter/Battery Cable (How Long?)
Discussion
sixor8 said:
Your reference earlier to the starter failing to turn IS the so-called 'hot start' issue. Either the failing immobiliser relay or just age and crispiness of the cables to the solenoid mean it does not engage when the engine is hot or even slightly warm if really bad! Many starters have been changed when they were fine, including mine. 
The ignition switch that the key engages can start to have a high resistance with age too. It's a Vauxhall item and I have replaced that too. 
I wired a starter solenoid into the start cct for my Griff, following the suggestion on this thread:
https://www.pistonheads.com/gassing/topic.asp?t=16...
Basically, you take the supply going to the solenoid that passes through the ignition switch and the immobiliser to energise a 12V relay, and use battery power to engage the solenoid. £10 worth of parts including a relay and some spade crimp connectors, but you need to get under the car and remove the started to do a neat job.
Is your post 'Simonwedge'? The ignition switch that the key engages can start to have a high resistance with age too. It's a Vauxhall item and I have replaced that too. I wired a starter solenoid into the start cct for my Griff, following the suggestion on this thread:
https://www.pistonheads.com/gassing/topic.asp?t=16...
Basically, you take the supply going to the solenoid that passes through the ignition switch and the immobiliser to energise a 12V relay, and use battery power to engage the solenoid. £10 worth of parts including a relay and some spade crimp connectors, but you need to get under the car and remove the started to do a neat job.
Looks like the same thing but in a different spot on the overall circuit.
I must admit I'd prefer to add a relay to an interior location, my car sees a bit of rain, and I've already had to replace a relatively new wiper park switch (and loom) because it sits in a prime spot for water to get it.
I have a receipt for a new FEBI 01204 ignition switch installed in 2017, so I'd like to think that's ok (but they're only a tenner), and a new starter motor at the same time, which theoretically leaves me with the initial point of this thread - a starter cable uprate job.
Your relay as is although rough is where it should be really, adding it to the fusebox is not something id advise even though i did it.
I chose to upgrade the starter main cable and also the solenoid cable to something a little more substantial but the latter isnt a must do.
Most problems occur on these cars from people doing crap jobs such as this.
Well done to penny though, the relay knowledge shone through on this one!
I chose to upgrade the starter main cable and also the solenoid cable to something a little more substantial but the latter isnt a must do.
Most problems occur on these cars from people doing crap jobs such as this.
Well done to penny though, the relay knowledge shone through on this one!
PabloGee said:
Is your post 'Simonwedge'?
Looks like the same thing but in a different spot on the overall circuit.
I must admit I'd prefer to add a relay to an interior location, my car sees a bit of rain, and I've already had to replace a relatively new wiper park switch (and loom) because it sits in a prime spot for water to get it.
I have a receipt for a new FEBI 01204 ignition switch installed in 2017, so I'd like to think that's ok (but they're only a tenner), and a new starter motor at the same time, which theoretically leaves me with the initial point of this thread - a starter cable uprate job.
That's the post that inspired me but it wasn't me. Looks like the same thing but in a different spot on the overall circuit.
I must admit I'd prefer to add a relay to an interior location, my car sees a bit of rain, and I've already had to replace a relatively new wiper park switch (and loom) because it sits in a prime spot for water to get it.
I have a receipt for a new FEBI 01204 ignition switch installed in 2017, so I'd like to think that's ok (but they're only a tenner), and a new starter motor at the same time, which theoretically leaves me with the initial point of this thread - a starter cable uprate job.
I bolted mine to the bonnet catch bolt like in the other photo in the thread. As I said in the other post, I didn't want to add to the battery area wiring. I have a trickle charge lead permanently attached so don't need to disturb the ECU etc. It is under the lip of the bonnet when closed so shouldn't get that wet, I don't use mine in the rain if I can help it!
I believe you only need to upgrade the starter cable if you're getting slow turn when hot, that can get crispy with age too.
Relay fitted inside the car is best practice
Relay similar to the one below is made for the job, it has bigger contacts than the one you have and handles the heavy pull-in starter current better https://www.autoelectricsupplies.co.uk/p/12-volt-r...
Here's a socket for the above relay if you wish to use one https://www.autoelectricsupplies.co.uk/p/fixed-soc...
Cable heavy enough for the job that doesn't go brittle at high engine temperatures
https://www.autoelectricsupplies.co.uk/p/thin-wall...
Run 4/0.30, 3.0mm², 33.0A, - cable OD 3.3mm Thin Wall cable from battery pos to relay terminal 30, run same size cable from relay terminal 87 to starter solenoid
Job's then a goodun
Relay similar to the one below is made for the job, it has bigger contacts than the one you have and handles the heavy pull-in starter current better https://www.autoelectricsupplies.co.uk/p/12-volt-r...
Here's a socket for the above relay if you wish to use one https://www.autoelectricsupplies.co.uk/p/fixed-soc...
Cable heavy enough for the job that doesn't go brittle at high engine temperatures
https://www.autoelectricsupplies.co.uk/p/thin-wall...
Run 4/0.30, 3.0mm², 33.0A, - cable OD 3.3mm Thin Wall cable from battery pos to relay terminal 30, run same size cable from relay terminal 87 to starter solenoid
Job's then a goodun
Would you suggest this as a heavier duty replacement of the hot start kit? The main difference in wiring being the feed to the starter solenoid?
Or is it a good candidate for siting above the pedal box, maybe under the dash top, then route to avoid exhaust/manifold - considering that the ignition immobiliser is already bypassed?
Or is it a good candidate for siting above the pedal box, maybe under the dash top, then route to avoid exhaust/manifold - considering that the ignition immobiliser is already bypassed?
981Boxess said:
sixor8 said:
Basically, you take the supply going to the solenoid that passes through the ignition switch and the immobiliser to energise a 12V relay, and use battery power to engage the solenoid. £10 worth of parts including a relay and some spade crimp connectors, but you need to get under the car and remove the started to do a neat job.
Someone (David Beer) worked out what needed doing to resolve the problem, knocked up an easy to follow DIY kit and called it the Modwise Hot Start kit.Perfect for people whose area of expertise isn’t car electrics.
PabloGee said:
Would you suggest this as a heavier duty replacement of the hot start kit? The main difference in wiring being the feed to the starter solenoid?
Or is it a good candidate for siting above the pedal box, maybe under the dash top, then route to avoid exhaust/manifold - considering that the ignition immobiliser is already bypassed?
The only thing that is needed is a relay to take the load off the cranking circuit, which is exactly what the Modwise kit did.Or is it a good candidate for siting above the pedal box, maybe under the dash top, then route to avoid exhaust/manifold - considering that the ignition immobiliser is already bypassed?
Some chap from Scotland bought his car. I wonder if it’s been restored back to standard.
It had a tonne of mods including XJS seats which being an old Jag fan I was disturbed at but they actually looked very good.
He did totally violate that car but when it did run well it was sweet as a nut on LPG.
There I said it
It had a tonne of mods including XJS seats which being an old Jag fan I was disturbed at but they actually looked very good.
He did totally violate that car but when it did run well it was sweet as a nut on LPG.
There I said it
981Boxess said:
................ and when it didn't you never got to hear about it 
But when he went quiet a week later he’d be on here telling us about his latest mod/ fix which usually gave the game away. A top fella in many ways though.
Having had my Jag converted as it was just a commuting tool at this point I had a soft spot for the savings that could be had. I never bothered questioning it but he claimed his 4.0 made 250 bhp on LPG which made me raise an eye brow a tad
He went onto a DB7 I believe. He always was a wafter type driver rather than a speed king.
I was slightly horrified by his multi tank configuration right behind him which I think were bespoke made and almost certainly weaker than a standard LPG tank which in his pursuit of every last mpg he completely ignored as any great mad scientist might do
I was slightly horrified by his multi tank configuration right behind him which I think were bespoke made and almost certainly weaker than a standard LPG tank which in his pursuit of every last mpg he completely ignored as any great mad scientist might do
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