I bought a 12V pump to move WVO, and attached the alligator clips to my battery terminals with the car running. I used the pump twice for around 20 minutes each time, it worked really well. then my alternator died (it was the original vajeo alt and volt reg with around 170k on them in my 93 300D), my indie mechanic told me the voltage reg was not touching completely anymore and caused an electrical arc that burned the thing that the brush was supposed to be touching, thus necessitating a whole new alt.

did the 12v pump do that?
is it OK to keep using the 12v pump attached to my car battery (with my new bosch alt)?

thanks for reading

Sounds like an unlucky coincidence to me. It shouldn't be a problem using the pump.
Jeff

__________________
1971 R600 Mack toterhome (SuperDawg)
99 NU-WA Snowbird 34+2 SE 102 5er
If it's not diesel, it's not in my stable!
53 F100 617.951/auto
95 Dodge 3500 Cummins/5 speed service truck

The alt died because it had 170k on it, not because of the pump.

I've powered far hungrier things off my car's 55A setup without a problem. (Power Inverter with a 32" TV and several lights for a few hours during an outage)

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Just thought I would mention the slip ring or the part that the brushes ride against is a replaceable cheap part on bosh alternators. So if you have one that is worn really bad but alternator is otherwise good change it.

thanks.