I have a 99 ''S'' Type Jaguar, I have a constant draw on the battery of between 1.5 to 2 amps. I have tried removing fuses to isolate the problem but with no luck. can you suggest any other checks please. Could itbe the alternator?
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You have a parasitic draw. Something is drawing power while the truck is sitting. Do you have any aftermarket items hooked to direct power? Something you leave plugged in to the 12V plug (cig lighter) Some 12v plugs are full time power and some are only powered with ignition on. Any amps wired direct power? If you have no aftermarket accessories drawing constant power you then need to determine what circuit has the draw. An amp clamp on the battery cable will show draw, then re & re 1 fuse at a time until you find the one that eliminates the draw. Once you've done that you need to find the problem on that circuit. All this is assuming your charging system is working and the battery is being properly charged while you're driving the truck.
Make sure there is no film on the top of the battery. moisture or residue can cause a draw across the battery terminals. Clean the battery first. The reason the amps drop is the capacitors in the ecu bleed off and the system only require enough voltage to memories alive in various modules-it is normal. Keep testing until you have a constant draw. Then start pulling fuses until you isolate it to a circuit.
with ampmeter take the current draw of battery max amp 30mA if more than 30mA remove fuse one at a time and watch if current draw go down. when current draw go down on a fuse than that is the circuit that drain your battery
I have done this before, put about a 10 amp charger on the battery. Pull the courtesy light fuse first. Look at the battery charger, it is probably charging several amps, pull one fuse at a time. When the charging amps drops down you found the fuse the controls the problem. I had a car several years ago that someone pulled the seat belt all the way out, somehow it was pulling a load and draining the battery overnight.
you seem to have a constant drain on the battery.
You can measure this by using a clamp amp meter on the battery positive wire. Try removing relays and fuses on parts of your electrical system until the drain goes down to a very low level. There is always a drain on the battery as it feeds the alarm etc. It may be that you have a hidden boot light or similar staying on due to a bad switch. If you do not have the correct type of amp meter - contact a good auto electrician and he will soon find the problem. As you have a problem with your wipers I would suggest taking the fuse and relay out to this first - as the problem may be here with a wire or connection fault.
Hope this helps - good luck.