[Roadsters] Gas tank electrical question

[Gary and Cindy Ault]

Pete,

Well, that is certainly embarrassing.  I was going from memory, and checked 
only the wiring diagram.  I didn't realize on terminal is grounded to the 
body through the mounting flange.  The separate ground wire must be there in 
case the mounting flange-body connection becomes corroded.

In theory it should not make a difference, but, with the configuration of 
the Nissan sending unit, it certainly does.  Sorry, Steve.

Gary

----- Original Message ----- 
From: "Pete Peters" <ppeters914 at comcast.net>
To: <datsun-roadsters at autox.team.net>
Sent: Sunday, March 14, 2010 6:26 PM
Subject: Re: [Roadsters] Gas tank electrical question


> It does make a difference. Backwards and you'll be shorting directly to
> ground causing gauge to always read full.
>
> Pete
>
> -----Original Message-----
> From: datsun-roadsters-bounces at autox.team.net
> [mailto:datsun-roadsters-bounces at autox.team.net] On Behalf Of Gary and 
> Cindy
> Ault
> Sent: Sunday, March 14, 2010 4:12 PM
> To: Steve Harvey; datsun-roadsters at autox.team.net
> Subject: Re: [Roadsters] Gas tank electrical question
>
> Steve,
>
> The tank unit is just a variable resistor, through which current flows to
> ground.  The deflection of the gauge depends on the magnitude of the
> current.  It should make no difference which way current flows through the
> tank unit.  If it were important, I think Nissan would have marked the
> terminals.
>
> Gary
>
> -----Original Message-----
> From: datsun-roadsters-bounces at autox.team.net
> [mailto:datsun-roadsters-bounces at autox.team.net] On Behalf Of Steve Harvey
> Sent: Sunday, March 14, 2010 3:12 PM
> To: datsun-roadsters at autox.team.net
> Subject: [Roadsters] Gas tank electrical question
>
> I drove over to Tim's house today and cut out the trunk floor from a 
> Junker
> which I'm going to install in my white 68 L18. I have a very nice gas tank
> that I'll be pulling in as well. My question is, there are two round 
> headed
> electrical connecter posts on the tank sending unit. Can I assume that one
> is the positive power post and the other a ground post? If that is 
> correct,
> does anyone know which of the two posts is (+) and which (-)?
>
> Thanks
>
> Steve
> Milwaukee
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