1979-1993 & 94 Conv [Subscribe to Daily Digest] |
With the car running, you can put the (+) probe on the starter cable at the starter, and then you can put the (-) on ground.
In a perfect world, this should give you the same reading that you get if you put the (+)probe on the alternator B+ terminal, and the other (-) on ground.
If it is the same (within a coupla tenths, anyway) then the problem is not between the alternator and the starter. That leaves the wire from the starter to the battery...You could measure voltage drops across these cables, too--one probe at the alternator, the other at the starter--this will show what the voltage drop across this cable is. One probe at the starter cable, and the other at the battery (+) will give you the drop along that run of cable. I suspect that one of these will say about 3 volts (bad) and the other will be <.1 (good).
**Ground can be the engine or chassis or battery (-)----They should all be the same (within a coupla tenths of a volt anyway--put one probe on the engine block, and one on the battery (-)...then try a probe on the engine block, and one on the chassis...then try one on the chassis, and one on the battery (-). All should be very low (<.1) volt)
You did re-connect the ground wire at the alternator, right?
You could try (carefully) using your jumper cables to connect from either the <starter> or< B+ on the alternator> to the battery (+)...this should bring the battery voltage right up to alternator B+.
***A really dead/bad battery might do this, too...
I would think that if the starter was getting hung up engaged this might happen, too.
SO>Have your battery fully charged and checked. Check your grounds. Clean and check your cable ends. Make sure the charge light comes on with the key on, and goes off when the car starts.
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