I was just at HF checking them out.
the 20 amp is for more modern smaller spade type fuses.

the 30 amp model is for 86 and up vanagon spade type fuses.
of course you could always clip jumper wires to the terminals and use it
wherever you want.

I got the 30amp version for $ 14.99 plus zero sales tax ..
looks like it'll work in fuse boxes like our 86 and later vanagons have.

but I might use it anywhere ..
like in series at the battery terminal ..
I'll just clip jumper wires to it.
HF calls it Item 67724

scott
www.turbovans.com

----- Original Message -----
From: "Loren Busch" <starwagen@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, November 08, 2011 5:45 PM
Subject: Harbor Freight Circuit Tester was D15 connector revealed

> Picked up one of these today
> <
> http://www.harborfreight.com/20-amp-automotive-fuse-circuit-tester-67725.html
>>
> But BEWARE, there apparently are two versions of this and the 20 amp
> version shown in that ad is NOT what you want for your Vanagon.  Although
> it might be made to work it is intended for use with the Mini spade fuses,
> not with ATC/ATO fuses (the bigger ones).  And it requires a Mini fuse to
> be inserted into the probe to work.  There is a 30 amp version that was
> hanging next to it at Harbor Freight but I didn't compare them, just
> assumed only larger capacity even though the same price.  I'm going to go
> back tomorrow and look at the 30 amp version to see if it is for the ATC
> type fuses.
> Details:  You can jam the probes into the socket for an ATC fuse but just
> barley.  And you have to have a supply of the Mini fuses for the probe.
> Not really the best setup.  And the HF website is wrong, they say that
> both
> the 20 amp and 30 amp are for ATC fuses, not true.  I hope the 30 amp
> version is actually for the ATC configuration.