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'90 740 battery slowly dying.....what if... 700

posted by  dfung on  Thu Oct 7 09:37 CST 2004
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It's the battery cable?

A few months my voltage regulator was ineffective (replaced it) and the ensuing drainage and load on the battery rendered the battery basically useless. Can you say 90 available cranking amps? Anyways, replaced the battery.

Now 3 months into the present, the car seems to be having starting issues again. Considering i just changed the battery and the voltage regulator, it has to be either the battery cables, the alternator, or perhaps there's a slow leak. I took a meter and measured 0 milliamps when in series with the positive terminal and it's associate cable.

So i decided to take some voltage measurements...

Car off...
Battery: 12.2V
Alternator: 12.2V (pos and neg terms)

Car On(idle)...
Battery: 12.6V
Alternator: 13.8V

Car On(engine sped up)...
Battery: 12.6V
Alternator: Forgot to measure

Do you think it could be the cables? I need to check the alternator voltage w/ the engine at speed, but even 13.8 V should be 'OK'. Surely the voltage should be the same at the battery.

What do you guys think?





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