I've recently had a problem starting the engine
(John Deere 4045DFM, less than 200 hours) in Boracay.
Problem was that the engine
would initially fire, then struggle to pick up speed to idle. Sometimes it would not start.
Initially I thought it was the battery
, as it was getting old (5 years). The battery
is an N120 which is a big battery. So I replaced the battery.
Now the engine starts much better, but there is still a RPM
drop just after it catches. I thought it could have been air in the fuel
, so I've bled the system (much better at it now) but there's still a bit of a drop.
My opinion is that it's due to my battery charge setup. I've the alternator
set up to charge the house batteries
(4 x Trojan T105s) and they got used pretty heavily over Christmas
. There's an Echo charge to top up the start batteries
So I'm thinking that as the engine starts the alternator
, and as it charges very well at idle RPM
it drags the engine down and sometimes stalls it. The easy solution is to keep the house batteries well charged, but that's not going to be happening all the time.
One solution that comes to mind would be to check that the alternator is excited by the start battery and to put a switch on the positive cable to the house bank. Turn off before starting, on the charge after the engine is running smoothly.
But am I correct, and what should I do? There's been no complaints from management as yet, but that could change...