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The full form should probably be 「さぁ…さっぱりわからない」, but is it OK to omit the
latter part in informal conversations and will that cause any confusion or
will it sound strange? I suppose it should be OK but I just want to make sure
because there seem to be multiple explanations to さっぱり。

Related: [Way to Use さっぱり (sappari) and すっかり
(sukkari)](https://japanese.stackexchange.com/questions/1507/way-to-
use-%E3%81%95%E3%81%A3%E3%81%B1%E3%82%8A-sappari-
and-%E3%81%99%E3%81%A3%E3%81%8B%E3%82%8A-sukkari).
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colloquial-language
Can I use 「さぁ…さっぱり。」 to express that I don't understand at all?
Insofar as the other party understands the context (in response to a request
for information or opinion), it is not uncommon to omit the latter part in
casual conversation. I can only provide anecdotal evidence, as I couldn't find
a source.

The same holds true for あー、すっきり（した）to convey a feeling of relief or being
refreshed.
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さっぱり mainly means:

  1. refreshed; neat; clean
  2. (as a [negative polarity item](https://japanese.stackexchange.com/a/16060/5010)) completely (not); entirely (not)​; (not) at all 

Please read the link. Since さっぱり is an NPI like 全然 and ちっとも, the latter half
of the sentence including ない can often be omitted.

> In many cases, this signal is strong enough that you can leave out the
> actual part of the predicate containing the negation (as long as it can be
> inferred from context)

さっぱり can be さっぱり売れない, さっぱり聞こえない or anything, depending on the context.

すっかり is not an NPI, so saying only すっかり can often be confusing. Also note that
さっぱりと (with と) is not an NPI.
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