Landy2021
Member Since: 23 Sep 2021
Location: Staffordshire
Posts: 27
 
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| Starter motor problems tdv6 |
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Hi there all we have a disco 3 and the damn thing has just gave up on starting, we have ruled out any electrical problems no warning lights or anything, we removed the starter off the disco and with it on the floor and wired it up to the car with jump leads and it worked every single turn of the key no problem so we reinstalled the starter and it started up no problem first flick of the key left it running for 5 mins turned it off and now it won’t work start again any ideas will be great thanks
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 23rd Sep 2021 4:59 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10647
 
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There is a relay in the fuse box under the bonnet marked SM.
Swap this for another relay (that you don't care about too much)
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| 23rd Sep 2021 6:03 pm |
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Landy2021
Member Since: 23 Sep 2021
Location: Staffordshire
Posts: 27
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Thanks for the reply we have tried everything all the wiring side of it is okay
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| 23rd Sep 2021 6:05 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10647
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auto or manual ?
relays are a common problem and an easy/cheap to eliminate.
Another thing you can try, is to ensure the gearbox is in P or N.
Remove the SM relay
Bridge the 2 large contacts briefly. It will spark a little.
See if the starter turns over easily.
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| 23rd Sep 2021 6:23 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8211
 
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Earth lead?- test with a jump lead from battery to engine. It can when others can't,
It will when others won't,
It goes where others don't.
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| 23rd Sep 2021 6:28 pm |
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Landy2021
Member Since: 23 Sep 2021
Location: Staffordshire
Posts: 27
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Pete K wrote:auto or manual ?
relays are a common problem and an easy/cheap to eliminate.
Another thing you can try, is to ensure the gearbox is in P or N.
Remove the SM relay
Bridge the 2 large contacts briefly. It will spark a little.
See if the starter turns over easily.
It’s an auto
We have moved it from p to n multiple times
we have tried bypassing the relay but there was nothing no spark or anything but when we reinstalled the relay and removed the relay wire of the starter and put a volt meter on the wire we were getting nearly 12v going down to the starter so I presume the relays good
When we had the sm off the car we wired it up to the car using 3 jump leads ( being very carful with the live cables) and every time we turned the key the starter engaged like it was brand new but once on the car it worked fine then stopped working
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| 23rd Sep 2021 6:50 pm |
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Landy2021
Member Since: 23 Sep 2021
Location: Staffordshire
Posts: 27
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M3DPO wrote:Earth lead?- test with a jump lead from battery to engine.
Thanks will try this tomorrow before removing the starter for the 5th time becoming a pro at it now
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| 23rd Sep 2021 6:51 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10647
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Earth lead does sound likely
You could add a jump lead between starter body and battery -
To prove or disprove.
Disconnecting the thin lead and measuring 12v isn’t fool proof
Could still be a bad wire.
Measure when still connected to starter
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| 23rd Sep 2021 7:21 pm |
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lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
 
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Landy2021 wrote:Pete K wrote:auto or manual ?
relays are a common problem and an easy/cheap to eliminate.
Another thing you can try, is to ensure the gearbox is in P or N.
Remove the SM relay
Bridge the 2 large contacts briefly. It will spark a little.
See if the starter turns over easily.
It’s an auto
We have moved it from p to n multiple times
we have tried bypassing the relay but there was nothing no spark or anything but when we reinstalled the relay and removed the relay wire of the starter and put a volt meter on the wire we were getting nearly 12v going down to the starter so I presume the relays good
When we had the sm off the car we wired it up to the car using 3 jump leads ( being very carful with the live cables) and every time we turned the key the starter engaged like it was brand new but once on the car it worked fine then stopped working
Volts are nice, but what you need is power, you said no spark so that says to me you have an issue further back up the line.
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| 23rd Sep 2021 7:34 pm |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1810
 
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Don't these starters have brushes so taking it out may have moved them and now they have settled back to normal position 
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| 24th Sep 2021 8:56 am |
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Landy2021
Member Since: 23 Sep 2021
Location: Staffordshire
Posts: 27
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Pete K wrote:Earth lead does sound likely
You could add a jump lead between starter body and battery -
To prove or disprove.
Disconnecting the thin lead and measuring 12v isn’t fool proof
Could still be a bad wire.
Measure when still connected to starter
Morning all went and tried turning the key just nothing put jump lead on bottom of starter and onto inner arch starts every time removed jump lead won’t start so I think it’s going to be an earth problem thanks for all the information
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| 24th Sep 2021 9:05 am |
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Landy2021
Member Since: 23 Sep 2021
Location: Staffordshire
Posts: 27
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Globetrotter448 wrote:Don't these starters have brushes so taking it out may have moved them and now they have settled back to normal position
Hi I stripped and cleaned the whole starter yesterday was filthy inside looks like new again now
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| 24th Sep 2021 9:06 am |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1810
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Well done with the earth strap. There is a position on the front of the engine where you can bolt an earth strap.
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| 24th Sep 2021 10:22 am |
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Landy2021
Member Since: 23 Sep 2021
Location: Staffordshire
Posts: 27
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Removed and cleaned all earth wires I think and it’s still the same can I join a new earth wire from the chassis to the startor motor
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| 24th Sep 2021 10:43 am |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1810
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I would join it to the engine block
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| 24th Sep 2021 11:18 am |
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