Im thinking of putting an ammeter in my 98 MPi and was wondering how to wire it.
Do i need to take a feed directly off my alternator, if so, which wire is it? Then is it simply earthed in the normal way, such as my voltmeter?
As i said, 98 MPi, am i best getting a 60 0 60 ammeter of is a 30 0 30 sufficient?
An ammeter will measure current flowing through it so you have to
literally cut the cable and stick it in between, I would opt for the
higher rated ammeter as if you look at the combined loads of all of
your electrical equipment it would probably be over 30 amps (headlamps,
fuel pump, heater blower etc) plus your alternator should be capable of
charging the battery at a pretty high rate too!
best place to wire it in? dependant on what you want to measure, most
people opt for the battery to solenoid feed ( big wire from battery to
engine bay) which basically involves extending the battery cable to
reach to meter and then reconnecting a new wire from the meter to the
some people put an extra ammeter in to monitor what the car is drawing
irrespective of whether the alternator is charging or not, this goes
between the battery, alternator feeds and all the output wires on the
solenoid, it all depends how much time you want to spend playing!
PS don't earth it! it might get rather hot!
Well - depends ;) If you do a proper job (as in using quality
connectors and wires with enough cross-sectional area) and if the
ammeter is ok it is. Also use good insulation on the ammeter terminals,
contact with anything earthed (like the dashboard rails) should be
Just for reference, here's a diagram:
> If safe then carry on, one cannot have too much clocks - lol.
True indeed ;)
As long as the cables are nicely protected from abrasion and routed
away from any sharp edges, you shouldn't have any problems.
We all know what happens when the battery cable becomes detached and
tries to be friends with the exhaust pipe! :-(
Rally cars route the battery cables and fuel/brake lines inside the car
to avoid damage to them from impact, the best thing to do is sleeve
everything up inside the car to help protect it.
The other thing that can be done to safeguard things is to fit a
battery isolator switch so that you can switch off the supply in the
event of any faults, ( a bit better than trying to find a spanner that
fits the terminals on your battery when smoke is issuing from under the
must have more clocks.......mmmmmm
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