Hello, hoping you can help. My first post! My 3.2 broke down for the first time in almost 7 years at the weekend. Started ok in the morning then after sitting for 5 hours after 100 mile drive would not start. Battery test concluded bad cell. AA man then concluded coil had live feed but was not switching. I'm a bit of a novice mechanic but from what I've read i will be trying a new battery and DME relay. Bentley manual notes the battery should be 88Ah but those i have seen online (Eurocarparts, Halfords, etc) suggest batteries with lower rating. The present battery is just 68Ah. I would be grateful if anyone can advise what spec. battery I need. Similarly the DME relay on the car is annotated 911 618 154 00 / 898247 / 12V / 15A whereas the replacements are marked 12V / 30A. I am no electrician but there is clearly a big difference between 15A and 30A. Can anyone explain what relay i need? If new battery and relay don't fix it i would be very pleased if anyone can suggest other things to check? Thank you Tim
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3.2 Battery & DME Relay
- Thread starter nixon
- Start date
If not cranking when hot but will bump start easily check the earth strap from transmission to body. I had hot start issue on way back from Classic Le Man's one year after a long period. Car would not start when hot but OK after it cooled. Checked earth strap looked OK but when lifted up off suspension tube was showing a lot of corrosion. Replaced and not happened since
Hope you find it quickly to make use of whatever decent weather we have left[
]
Hope you find it quickly to make use of whatever decent weather we have left[
Hi TimORIGINAL: nixon
Hello, hoping you can help. My first post! My 3.2 broke down for the first time in almost 7 years at the weekend. Started ok in the morning then after sitting for 5 hours after 100 mile drive would not start. Battery test concluded bad cell. AA man then concluded coil had live feed but was not switching. I'm a bit of a novice mechanic but from what I've read i will be trying a new battery and DME relay. Bentley manual notes the battery should be 88Ah but those i have seen online (Eurocarparts, Halfords, etc) suggest batteries with lower rating. The present battery is just 68Ah. I would be grateful if anyone can advise what spec. battery I need. Similarly the DME relay on the car is annotated 911 618 154 00 / 898247 / 12V / 15A whereas the replacements are marked 12V / 30A. I am no electrician but there is clearly a big difference between 15A and 30A. Can anyone explain what relay i need? If new battery and relay don't fix it i would be very pleased if anyone can suggest other things to check? Thank you Tim
Go for the 88Ah battery only £10 more and one can never have a enough power. The DME relay is under the pass seat next to the ECU and a good time to change it. But i think you need to change the TDC and speed sensors on the N/S top of the gearbox bell houseing not the easiest of jobs and they need a 1mm gap as in the Bentley manual.
Thank you all for your thoughts.
When there is life in the battery the starter cranks ok but won't start. I have not tried bumping it. Is jumping it something to avoid, might it do damage?
Charles, when you say not the easiest of jobs is it a job for a novice? I am keen to get to know my car better but wouldn't want to attempt a job beyond me. How are these sensors accessed? Should it take 10mins or 10hrs?!! As regards the relay, are replacements 30A? Thank you Tim
When there is life in the battery the starter cranks ok but won't start. I have not tried bumping it. Is jumping it something to avoid, might it do damage?
Charles, when you say not the easiest of jobs is it a job for a novice? I am keen to get to know my car better but wouldn't want to attempt a job beyond me. How are these sensors accessed? Should it take 10mins or 10hrs?!! As regards the relay, are replacements 30A? Thank you Tim
The 30A is the rating of the relay contacts - not the amount of current they consume! Therefore a 30A relay will switch twice the current of a 15A relay, so the contacts will last longer.
I just looked at the spare one I carry in the glove box. My indy got it for me from Euro Car Parts, and their reference number is 450.33.0390. On the box, it shows the manufacturers name as KAE, and their part number 3.308.100. On the relay itself it shows the part number, and 12VDC / 30A.
Hope this helps.
Hope this helps.
ORIGINAL: nixon
Thank you all for your thoughts.
When there is life in the battery the starter cranks ok but won't start. I have not tried bumping it. Is jumping it something to avoid, might it do damage?
Charles, when you say not the easiest of jobs is it a job for a novice? I am keen to get to know my car better but wouldn't want to attempt a job beyond me. How are these sensors accessed? Should it take 10mins or 10hrs?!! As regards the relay, are replacements 30A? Thank you Tim
I can do this job on my lift in about 2.5hr. so you will be on your back i guess, you will need to jack up the N/S/R and remove the wheel to work in that gap, cover the brake disc and caliper they will make you dirty, Good lighting is a must. 4hr !!
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