Boat wiring - instruments
 

I'm rehabing my old '90 Chris Craft Limited 245....I/O...350
cobra...runs great.. I'm- basically redoing all of the front end
wiring, instrumentation and breakers (was in **** poor condition when
i got it). I have the instrument panel on my workbench and I'm wiring
up the new instruments....daisy chaining the Ground, the Ignition, and
Light terminals. Checked my continuity between the instruments on
each line (G, I, L), and of course since they are all daisy chained, i
get continuity. Great, that is expected. What isn't expected is
that i am getting continuity across the G, I, L, and S terminals on
the instrumenets, including instruments right out of the box with no
wiring hooked up to them. This doesn't make sence that this would
be. I wired everything up and tested my lightning and even though it
appears there is a short across the terminals, the lighting works.
The majority of my instruments are Teleflex, if that matters.

Any suggestions??

Boat wiring - instruments
 

Boat wiring - instruments
 

On May 31, 6:45 pm, Brian Cleverly wrote:
wrote:
I'm rehabing my old '90 Chris Craft Limited 245....I/O...350
cobra...runs great.. I'm- basically redoing all of the front end
wiring, instrumentation and breakers (was in **** poor condition when
i got it). I have the instrument panel on my workbench and I'm wiring
up the new instruments....daisy chaining the Ground, the Ignition, and
Light terminals. Checked my continuity between the instruments on
each line (G, I, L), and of course since they are all daisy chained, i
get continuity. Great, that is expected. What isn't expected is
that i am getting continuity across the G, I, L, and S terminals on
the instrumenets, including instruments right out of the box with no
wiring hooked up to them. This doesn't make sence that this would
be. I wired everything up and tested my lightning and even though it
appears there is a short across the terminals, the lighting works.
The majority of my instruments are Teleflex, if that matters.

Any suggestions??

What Ohm scale range are you using on the meter ?

You are reading the resistance of internal components... Increase the meter
scale range to highest and see what you get... I'll bet it is not a dead short.

Brian C

i'm getting about 70 ohms between IGN and GND, 1 ohm between LGHTS
and GND, 70 between LGHTS and IGN, and about 85 between IGN and SNDR.

Boat wiring - instruments
 

Boat wiring - instruments
 

On May 31, 9:39 pm, Brian Cleverly wrote:
wrote:
On May 31, 6:45 pm, Brian Cleverly wrote:

wrote:

I'm rehabing my old '90 Chris Craft Limited 245....I/O...350
cobra...runs great.. I'm- basically redoing all of the front end
wiring, instrumentation and breakers (was in **** poor condition when
i got it). I have the instrument panel on my workbench and I'm wiring
up the new instruments....daisy chaining the Ground, the Ignition, and
Light terminals. Checked my continuity between the instruments on
each line (G, I, L), and of course since they are all daisy chained, i
get continuity. Great, that is expected. What isn't expected is
that i am getting continuity across the G, I, L, and S terminals on
the instrumenets, including instruments right out of the box with no
wiring hooked up to them. This doesn't make sence that this would
be. I wired everything up and tested my lightning and even though it
appears there is a short across the terminals, the lighting works.
The majority of my instruments are Teleflex, if that matters.

Any suggestions??

What Ohm scale range are you using on the meter ?

You are reading the resistance of internal components... Increase the meter
scale range to highest and see what you get... I'll bet it is not a dead short.

Brian C

i'm getting about 70 ohms between IGN and GND, 1 ohm between LGHTS
and GND, 70 between LGHTS and IGN, and about 85 between IGN and SNDR.

The only reading that could be called anywhere near to a "short" is the
LGHTS-GRND. That will be meauring the resistance of a light bulb. Why don't
you remove a bulb and check it specifically.

Personally, without knowing the specific instruments, I'd say everything is AOK.

Brian C

Yeah, I get the same thing across the bulb....Guess everything is fine
then. I'm used to working with AC where any continuity across hot and
ground is a very bad thing!!

Boat wiring - instruments
 

Boat wiring - instruments
 

On Sun, 01 Jun 2008 07:41:01 -0500, dazed and confuzzed
wrote:

Measure the resistance of a cold incandescent bulb sometime. AC or DC
doesn't matter. Cold they are nearly a short.

The resistance goes up 30 to 50 times as they heat up.

Casady

Boat wiring - instruments
 

Richard Casady wrote:
On Sun, 01 Jun 2008 07:41:01 -0500, dazed and confuzzed
wrote:


Measure the resistance of a cold incandescent bulb sometime. AC or DC
doesn't matter. Cold they are nearly a short.


The resistance goes up 30 to 50 times as they heat up.

Casady
my point exactly. He's measuring them cold.

--
“TANSTAAFL”
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America: Ironically, the safest place to be anti-American.
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"A prudent man foresees the difficulties ahead and prepares for them;
the simpleton goes blindly on and suffers the consequences." - Proverbs 22:3