AC fuse keeps blowing on 93.5 v12 : AC clutch or?

(Aristides Balanos) #61

The diode is connected in parallel with the coil, you have to disconnect it from the coil to measure it.
The coil is 4 Ohms or about, not far from a dead short, and bipolar, so however you measure the assembly the multi-meter will be always seeing the coil, there might be some variation, but I think not conclusive.

Aristides

#62

yes the diode is in parallel with the coil, but hidden somewhere in the loom,
as per the electrics schematics posted earlier

I’ve got several multimeters, and most have a diode mode, where the value shown is 1 (infinite) or some voltage around 0.6V (or 600mV), which is the diode threshold voltage
I tried using a milliohmmeter, and it was confused by the dioded in the wiring
I didn’t have time to do the same measurement again, but with the coil out of the loom : I’m almost sure the reading will show if the diode is ok or not (the original one , in the loom)

the “free wheeling diode” won’t get much current, as the voltage spike is short : 1N4007 should be fine (or I hope so)

#63

sorry for the delay before coming back : as I had to take the radiator upper cross member to change the clutch, I took the opportunity to get the radiator out and have it checked

It’s back and fitted, so I started refitting everything back together during the previous weekends

The air cond compressor clutch now works, no more blown fuse, and I get some cold

It took a while to get the parts, but the job isn’t too bad, and saved a compressor replacement (and circuit purge and refill)