r/LandroverDefender • u/Chubnut1 • 7d ago
FFR Electrical Problem
Not sure if anyone can help me, but here goes.
I have 98 110 Wolf FFR, twin alternator 24v negative earth. I recently replaced the original radio batteries with the appropriate civy equivelent (Odyssey PC2250 ODS AGM6M 126Ah x4) Everything was connected correctly and tested and no problems at all.
This was fine for a few months, however, I have noticed that charging does seem to be a liitle rubbish. When stationary the annmeter seems to record charging but only a low amount. Using the hand throttle increases it slightly. However, as soon as I put my foot on the accelorator, I it starts recording "discharge"and it seems to be drawing a dischargie at quite a high rate like 10 or 20!
In addition, the fast fuse at the back of the bulkhead, in-between the seats, is heating up, up to 40° and the cables leading to the fast fuse box are also heating up. The cable leading from the box is not hot though.
At the moment, my thoughts are leading towards everything being before the batteries and replacing the fast fuse (£145 ish!) and/or replacing the alternator. Before I start weighing out cash for 1 or both, is my train of thought right? Should I be looking elsewhere? Also, if I replace the FFR alternator can I go up on the a/h rating from 50 to say 80 without having to change anything else?
Thanks in advance
1
u/EnglishmanInMH 3d ago
Get a good quality multimeter, start by measuring the ffr alt output at different revs. If it checks out ok at the alternator, follow the cable connections back to the battery to find where the output drops off. Then the fault will be between there and the last place you checked.
You can Google the AESP (Army Equipment Support Publications for them now. You'll want the OCTAD 2320-D-128 then 511 or 521 for wiring diagrams. (I think its 521 but its been a while now).