a1 to ground .4 ohms with different meter 0 with tone
a2 to ground .5 ohms with different meter 0 with tone
a3 to ground .4 ohms with different meter 0 with tone
a1 to ground 0 with tone
a2 to ground 0 with tone
a3 to ground 0 with tone
The first test says it's toast (cold).
The second test says it's toast (hot)
A tone on my meter indicates continuity, a connection.
Any meter reading less than infinity, will indicate a connection to ground. Example .3849002 indicates a connection bearing that many ohms (shorted to ground)
. If your meter doesn't use the infinity symbol, you may see OL
(open line), which will mean there's no connection to ground (good).
Below is from the manual, except I changed the word alternator to stator. Don't know why they have two tests listed, "installation" and "insulation". They're both the same test except the range settings. There should be no connection between ground and the stator coils (leads).
Stator Coil Installation Test
1. Disconnect stator leads.
2. Using the highest range of the tester, measure the resistance between each yellow lead and chassis ground.
*Any meter reading less than inifinty (∞) indicates a short, necessitating stator replacement.
Stator Coil Insulation Test
Meter range: 1 x kΩ
Connection: Stator leads (disconnected)
.. One meter lead - One yellow stator lead
.. Other meter lead - Chassis ground
Reading: No reading (∞Ω)