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I had a strange fault with my Mk2 jag yesterday. It is a 3.8 with manual overdrive which has been converted from an auto (not by me). I had a high torque starter motor fitted last year as the old one packed up. So yesterday, I had it MOT'd in the morning, and drove it to work - no problem. I came to leave yesterday evening, turned the ignition key, alternator light came on, pushed the starter button - nothing, not a click, no sign of life. So I got my mate to help me push the car out of the parking space, to try bump starting it down the slope of the car park - pushed the start button and it fired up as if nothing had happened! Any thoughts on what this might be - I suspect its dodgy wiring, but if anyone has any thoughts before I tear into it, I'd appreciate them. cheers Cortinaman  |
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Old Fords never die they just go sideways
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ChasR
RR Helper
motivation
Posts: 10,192
Club RR Member Number: 170
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I'd go with dodgy wiring as well, an iffy ignition switch or a broken terminal on the starter.
Is it an internia starter motor on these?
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Jan 31, 2013 10:04:31 GMT
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The starter was replaced with a new high-torque/gear reduction starter not long ago, so it is not original - I don't know whether its pre-engaged or inertia.
I'm going to have a look at the wiring to the iginition switch and start button as they are pretty easy to see, and work on from there.
cheers
Cortinaman
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Old Fords never die they just go sideways
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,158
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Jan 31, 2013 10:16:51 GMT
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I'd go with the start button too, it'll feed to a solenoid somewhere, probably on top of the starter. I think all these hi-torque starters are just a Nippon-Denso unit.
There may even be a relay in the starter circuit, i.e. turn on ignition, activates relay, relay feeds to starter switch.
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ChasR
RR Helper
motivation
Posts: 10,192
Club RR Member Number: 170
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Jan 31, 2013 10:33:47 GMT
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It it is a gear reduction start motor I would say that it most likely to be a pre-engaged starter motor.
I would check the starter motor connection at the solenoid if you do you have no clicking present.
The relay feed depends. Many starter motors until the 80s did not have relays in the starter motor circuit, although a number of people (including the previous owner of my Stag) have added them so as to ensure more reliable starting, and less current being drawn through the ignition switch etc.
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Jan 31, 2013 11:54:41 GMT
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the gear reduction hi-torque starters draw much much less current than the old inertia one so relays not that essential really....and are hugely reliable using nippon-denso gubbins
suspect a duff bullet connector somewhere.
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Jan 31, 2013 11:58:59 GMT
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Has it been rewired? Or is it still running the original rubber-insulated cloth-armoured loom? If it's not been rewired I'd suggest doing so as a matter of urgency: in my experience the rubber insulation will be falling apart now, causing untold trouble.
Does sound like dodgy wiring between the starter button and the solenoid - which will be on the motor.
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Jan 31, 2013 12:03:43 GMT
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Thanks for all your answers.
It hasn't been re-wired, and it really does need it - its just such a major job, I've not leapt in to do it!
I'll check the various connections and and see how we go.
cheers
Cortinaman
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Old Fords never die they just go sideways
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Jan 31, 2013 12:34:43 GMT
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If it was originally an auto there would have been an inhibitor switch on the auto box.Try and find where the wiring has been linked out .Possibly near the gearbox and check that.
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Jan 31, 2013 12:50:25 GMT
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If it was originally an auto there would have been an inhibitor switch on the auto box.Try and find where the wiring has been linked out .Possibly near the gearbox and check that. Good shout. |
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Jan 31, 2013 15:11:48 GMT
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If it was originally an auto there would have been an inhibitor switch on the auto box.Try and find where the wiring has been linked out .Possibly near the gearbox and check that. Thats a good idea - I know the anti-creep valve in the brake system wasn't removed when the gearbox conversion was done, so I wouldn't be surprised if the inhibitor switch hasn't been properly bypassed. Another bit of wiring to check! cheers Cortinaman |
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Old Fords never die they just go sideways
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