Alternator and fuel pump
Discussion
I think i may see some light at the end of the tunnel 
I have been having the odd electrical problem with the stalling and coughing and spluttering, now i have pretty much changed everything electrical on the engine as a basic overhaul, and one of things that was left to do is the fuel pump , now I have been advised that the pump could possibly be failing!
i checked this today and on the engine running is pulling 10.4V is this normal?
I then checked my alternator and that at source is producing 15.3/6V (which i think could be a little high)
as a matter of course i then checked the dreaded 100a fuse and low and behold it has blown(the easy fix)
What i need to know before i go spending even more money before my april deadline , is the running voltage of the pump wrong and also is the alternator over running as it is not pulling any load due to the fact the fuse has blown........
just the last few bits of a very long road then , summer driving here i come.
I have been having the odd electrical problem with the stalling and coughing and spluttering, now i have pretty much changed everything electrical on the engine as a basic overhaul, and one of things that was left to do is the fuel pump , now I have been advised that the pump could possibly be failing!
i checked this today and on the engine running is pulling 10.4V is this normal?
I then checked my alternator and that at source is producing 15.3/6V (which i think could be a little high)
as a matter of course i then checked the dreaded 100a fuse and low and behold it has blown(the easy fix)
What i need to know before i go spending even more money before my april deadline , is the running voltage of the pump wrong and also is the alternator over running as it is not pulling any load due to the fact the fuse has blown........
just the last few bits of a very long road then , summer driving here i come.
If your 100 amp fuse blows this means that the alternator has nowhere to dump it's power (the battery) so the voltage will go very high and can cause the alternator to fail. It sounds like yours has survived the ordeal.
However if your fuel pump is showing only ten volts (I assume at the pump terminals)then I would be looking at the wiring and the rotting there of. When the engine is running and the alternator charging, the battery will have about 13.8 volts across it. If your fuel pump only has 10 volts across it then your loosing nearly 4 volts across the wiring that supplies your pump.
So the pump is drawing a massive current or you have high resistance in the wiring between the battery and the pump, so I would be looking at poor contact at the pump or any connector in the circuit between battery/ECU and pump terminals.
Good luck.
Paul.
However if your fuel pump is showing only ten volts (I assume at the pump terminals)then I would be looking at the wiring and the rotting there of. When the engine is running and the alternator charging, the battery will have about 13.8 volts across it. If your fuel pump only has 10 volts across it then your loosing nearly 4 volts across the wiring that supplies your pump.
So the pump is drawing a massive current or you have high resistance in the wiring between the battery and the pump, so I would be looking at poor contact at the pump or any connector in the circuit between battery/ECU and pump terminals.
Good luck.
Paul.
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