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Electrical problem please help
Hello allhttp://www.surreyscoobies.co.uk/foru...smilies/hi.gif.
Yet another chapter to this cars line of problemshttp://www.surreyscoobies.co.uk/foru...s/censored.gif. Car will run fine but as soon as you put your foot down (put on boost) the main fuse will blow. The car starts to judder, then pop. Its the fuse box in engine bay, centre of the three 45amp fuses. If you drive the car like an old granny it seem's to be ok in the main, although it did blow once at low speed. No electrical componants have been changed recently and I have checked all round the engine for loose/broken or chafed wires. Any help would be appreciated, as I have only just got this car back on the road and its sending me round the bendhttp://www.surreyscoobies.co.uk/foru...ilies/loco.gif. Cheers Del |
Mine melted the loom across the front by rad as the headers were so close. Check earth strap to engine?
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Originally Posted by jimes
(Post 9110009)
Mine melted the loom across the front by rad as the headers were so close. Check earth strap to engine?
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I would say it has to be ground related.
Try jump lead from neg bat to block? |
Also check the voltage at bat terminals and alternator.
The invertor may have gone and you are seeing higher voltage or current? |
Originally Posted by Jolly Green Monster
(Post 9110385)
Also check the voltage at bat terminals and alternator.
The invertor may have gone and you are seeing higher voltage or current? |
if its blowing a 45a thats quite a short somewhere. Unfortunately it may be a case of stripping off some of the black tape on parts of loom and looking for short, had to do this on a granvia last week but got lucky and found it by the diesel pump almost straight away. Did have a wiring diagram on disc but cant find it, seem to remember one of those fuses being the fuel pump. Strange that it does it under load but weird things can happen with wiring faults!
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think the other 2 are for the rad fans so maybe check there......
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Originally Posted by jimes
(Post 9110576)
think the other 2 are for the rad fans so maybe check there......
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13.7 with engine off!!!!
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Originally Posted by Jolly Green Monster
(Post 9111598)
13.7 with engine off!!!!
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put a meter on it whilst running and see how high it goes......
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13.7v with engine off is too high.. you have issue with alternator I suspect..
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Originally Posted by jimes
(Post 9112437)
put a meter on it whilst running and see how high it goes......
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Originally Posted by Jolly Green Monster
(Post 9112456)
13.7v with engine off is too high.. you have issue with alternator I suspect..
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Have you identified exactly what the fuse controls ie:which wires and circuits are associated with the fuse?
I somehow doubt the battery or the altenator is at fault from what i have read, so the following is just basic checks as you have done. Have you checked the bolted connector/terminal under the fuse box in the engine bay ie: clean and dry? Although the altenator is charging, have you checked that the altenator belt is tight? If you test the voltage of the battery immediately after turning the engine off, the voltage in the battery will be as high as 13.7V very easily, If you want to get a true reading from the battery do it in the morning before you start the car, as the battery will have had a couple of hours to stabilise. The trip out(maximum voltage) for the altenator will be 14.4V but no higher than that, but as you say check it while driving as you might be getting a voltage spike. You also need to check what the amperage is at maximum charge voltage with and without the loads on (lights, fans,etc). You will need an amp guage to test this, which you most likely wont have. |
Originally Posted by Brett_555_Sti
(Post 9113820)
Have you identified exactly what the fuse controls ie:which wires and circuits are associated with the fuse?
I somehow doubt the battery or the altenator is at fault from what i have read, so the following is just basic checks as you have done. Have you checked the bolted connector/terminal under the fuse box in the engine bay ie: clean and dry? Although the altenator is charging, have you checked that the altenator belt is tight? If you test the voltage of the battery immediately after turning the engine off, the voltage in the battery will be as high as 13.7V very easily, If you want to get a true reading from the battery do it in the morning before you start the car, as the battery will have had a couple of hours to stabilise. The trip out(maximum voltage) for the altenator will be 14.4V but no higher than that, but as you say check it while driving as you might be getting a voltage spike. You also need to check what the amperage is at maximum charge voltage with and without the loads on (lights, fans,etc). You will need an amp guage to test this, which you most likely wont have. Checked wires going to fuse box and all seem ok. HOWEVER A CONFESSION FROM MY SON!!!!!!!!!!!!!!!!!!!!! He used my car while I was at work to jump start his mates car. They connected both leads to the other car and then when connecting to mine, which was running apparenly, they put them on the wrong terminals. Apart from the alternator is the anything else in the charging circuit, that controls the amount of power output??? and what other damage is possible? Cheers Del |
Reg in alternator
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Originally Posted by Jolly Green Monster
(Post 9115352)
Reg in alternator
Thanks to everyone for their help and advice.:thumb: Cheers Del |
Still doing it
Changed alternator today for a known good one and the problem persists.
Drove the car for around 5 miles gently with no problem, as soon as i put my foot down (in second about half throttle) pop fuse gone again. Any mor ideas? |
I suspect a main live has melted> posibly the starter cable> and as your accelerating the engine rock is causing it to short to earth.
I suspect accelerating hard in any gear will cause this. Check all the main live feeds to starter fuse box etc< check theres nothing bare and nothing able to eath out. |
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shame your not a bit closer, love finding electrical faults! try moving the loom around where you can to simulate engine moving to see if you can get the fuse to blow which would narrow down a problem in the loom. it goes right across the front from fuse box under bonnet to drivers side inner wing then into car. When mine melted at front due to headers it did some weird and wonderful things! does it do it everytime you boot it? does it do it if you rev high but slowly if you see what i mean?
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any joy?
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Originally Posted by jimes
(Post 9121423)
any joy?
If I didn't know better I would have thought that there was a camera filming me somewhere as this is getting rediculous.:brickwall |
Guy with a small hand called Jeremy?! That is weird. Try removing fuse 12 or whatever the fuse was that's fed by the 45a one. Would at least narrow it down a bit
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Fault could be on the Boost Control side of things - pressure exchange/wastegate control solonoids ??
Mick |
Originally Posted by merlin24
(Post 9124801)
Fault could be on the Boost Control side of things - pressure exchange/wastegate control solonoids ??
Mick |
Originally Posted by jimes
(Post 9124417)
Guy with a small hand called Jeremy?! That is weird. Try removing fuse 12 or whatever the fuse was that's fed by the 45a one. Would at least narrow it down a bit
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