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KB2VXA > TECH 12.08.04 07:13l 50 Lines 2237 Bytes #999 (0) @ WW
BID : 26257_WT3V
Read: GUEST OE7FMI
Subj: Re: VK5IE > car batts
Path: DB0FHN<DB0FOR<DB0SIF<DB0EA<DB0RES<ON0AR<VE2PAK<N1UAN<W1GMF<W1ON<
W1ON-5<K1UOL<K1UOL<WX1CT<WA2PNU<KC2COJ<WT3V
Sent: 040810/2026 26257@WT3V.#CNJ.NJ.USA.NOAM $:26257_WT3V
From: KB2VXA@WT3V.#CNJ.NJ.USA.NOAM
To : TECH@WW
Hi Bill and readers,
With all the questions you raised you haven't muddied the waters, you
watered the mud! (;->)
First of all there was never any reason to disconnect a car battery when
charging. In the generator system the reverse current relay was only
engaged when the motor was running, the generator spinning. When off the
relay disconnected the battery from the charging system. In a solid state
alternator system the characteristics of the solid state devices
naturally prevent reverse cuurent, such is the nature of a diode. BTW, a
high current diode isolates an RV's secondary battery so lighting and
acessory current doesn't drain the primary (engine) battery yet allows
charging off the alternator.
As for the welding school, seems like some instructor doesn't know where
to connect the return (earthing) lead. I f connected to anything other
than the part being welded sparks could fly and I don't mean from the
rod! One exception is high iron work where it's connected at ground
level, but we're not building a skyscraper here. (;->) In the case of
welding something on a motor vehicle, if not connected to the part being
welded or at least as close as possible bonding straps can pop like
fuses. That's why it's advisable to disconnect the negative battery post
grounding lead from the frame as well, but then again there are those
engine bonding straps to consider. It becomes a moot point if you connect
the return lead to the block when welding on the engine, but then the
engine is usually removed making yet another moot point. Seems like a bit
of confusion but not so when the return current path is considered so put
the lead in the right spot and you won't have any problems.
Then again every mechanic I ever knew use a gas torch when welding on the
vehiocle itself, maybe they know something they don't teach in school?
(;->)
73 de Warren, KB2VXA@WT3V.#CNJ.NJ.USA.NOAM
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Message timed by cesium laser: 20:36 on 2004-Aug-10 GMT
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