Tachometer doesn't work

[Ryan Wright]

Need some help with my tachometer. As the story goes, it quit working
so the previous owner had a brand new one put in but it didn't solve
the problem. Sure enough, I have a brand new tach in my dash with all
zeros on the hour meter that doesn't work.

I'd like to fix this. I think the tach is a rather important piece of
equipment. :-)

Any advice? I have no idea where to start, other than finding the
sending unit or engine connection (where?) and testing (how?) or
replacing it, and/or tracing the wires between it and the tach.

One note: Three of the wires going to the tach - two white (on the
same terminal) and one grey - all have had their insulation MELTED off
from where they connect to the tach, back several inches. This scares
me. Thankfully, the damage does not extend into the wiring harness;
just before the wires enter the bundle, they're fine, and everything
else under the dash is pristine. I traced the bundle in question
several feet into the dash and the tach wires are intact throughout
there. So, not sure what the deal is or how this happened. Sure looks
like overloaded wire damage to me but usually that extends throughout
the wire and damages other wires in the vicinity; this is not the case
here.

Thank you for any clues you can offer me.

-Ryan
'86 PT-40 8V92
Tri-Cities, WA

[martingregg598]

Hi Ryan, personally I would want to be absolutely positive that these
wires are good all the way back to the other end. After you find out
where they go then you could run a continuity check or in this case a
non-continuity. If the insulation is melted off, there had to be a
problem, maybe the old tach, maybe not, maybe to much current running
through them, if that is the case they could be melted in other spots.
I would think that if a wire had gone to ground then there would have
been a short that would have taken out the fuse or breaker. Do the
wires themselves look burnt? A lot of times when there is too much
current, the copper strands will be burnt, if that is the case, the
wire is bad.
Marty
95 BMC 37
Kennewick Wa.

[Ryan Wright]

Hi Marty,

Thanks for the reply. We need to get together one of these days,
considering we're practically neighbors.

I guess I'll have to dig into my engine's documentation to see if
there is information concerning the tachometer connection point. If I
knew where to find that on the engine I'd at least have a place to get
started! Tracing the wire will be my first priority; if that's good,
then I'll fire up the engine and see if I'm getting a signal directly
from there.

I don't suppose anyone has a diagram of the tachometer system?? Would
be nice to know where the wires go, where any fuses or relays are,
etc.

-Ryan

On 6/1/07, martingregg598 wrote:
>
> Hi Ryan, personally I would want to be absolutely positive that these
> wires are good all the way back to the other end. After you find out
> where they go then you could run a continuity check or in this case a
> non-continuity. If the insulation is melted off, there had to be a
> problem, maybe the old tach, maybe not, maybe to much current running
> through them, if that is the case they could be melted in other spots.
> I would think that if a wire had gone to ground then there would have
> been a short that would have taken out the fuse or breaker. Do the
> wires themselves look burnt? A lot of times when there is too much
> current, the copper strands will be burnt, if that is the case, the
> wire is bad.
> Marty
> 95 BMC 37
> Kennewick Wa.
>

[Leroy Eckert]

The tach drive may be installed in one of 4 or 5 places. Send me your e-mail and
I will send you copies of the Service manual I have. Wiring from the drive to
the front I do not have.
Leroy Eckert
1990WB-40"Smoke N Mirrors"
Niceville, FL
----- Original Message -----
From: Ryan Wright
To: WanderlodgeForum@yahoogroups.com
Sent: Saturday, June 02, 2007 4:31 PM
Subject: Re: [WanderlodgeForum] Re: Tachometer doesn't work


Hi Marty,

Thanks for the reply. We need to get together one of these days,
considering we're practically neighbors.

I guess I'll have to dig into my engine's documentation to see if
there is information concerning the tachometer connection point. If I
knew where to find that on the engine I'd at least have a place to get
started! Tracing the wire will be my first priority; if that's good,
then I'll fire up the engine and see if I'm getting a signal directly
from there.

I don't suppose anyone has a diagram of the tachometer system?? Would
be nice to know where the wires go, where any fuses or relays are,
etc.

-Ryan

On 6/1/07, martingregg598 wrote:
>
> Hi Ryan, personally I would want to be absolutely positive that these
> wires are good all the way back to the other end. After you find out
> where they go then you could run a continuity check or in this case a
> non-continuity. If the insulation is melted off, there had to be a
> problem, maybe the old tach, maybe not, maybe to much current running
> through them, if that is the case they could be melted in other spots.
> I would think that if a wire had gone to ground then there would have
> been a short that would have taken out the fuse or breaker. Do the
> wires themselves look burnt? A lot of times when there is too much
> current, the copper strands will be burnt, if that is the case, the
> wire is bad.
> Marty
> 95 BMC 37
> Kennewick Wa.
>




[Non-text portions of this message have been removed]

[Art Weatherly]

I am very curious as to is fouind on this tach. problem. I am having the same
problem (tach doesn't work).

I've been told that the sender is by the right by exaust manifold. I have not
found it. Whatever information you come
across please post.

Art Weatherly
Riverside Ca.
'85 PT36
----- Original Message -----
From: Ryan Wright
To: WanderlodgeForum@yahoogroups.com
Sent: Saturday, June 02, 2007 2:31 PM
Subject: [SPAM] Re: [WanderlodgeForum] Re: Tachometer doesn't work


Hi Marty,

Thanks for the reply. We need to get together one of these days,
considering we're practically neighbors.

I guess I'll have to dig into my engine's documentation to see if
there is information concerning the tachometer connection point. If I
knew where to find that on the engine I'd at least have a place to get
started! Tracing the wire will be my first priority; if that's good,
then I'll fire up the engine and see if I'm getting a signal directly
from there.

I don't suppose anyone has a diagram of the tachometer system?? Would
be nice to know where the wires go, where any fuses or relays are,
etc.

-Ryan

On 6/1/07, martingregg598 wrote:
>
> Hi Ryan, personally I would want to be absolutely positive that these
> wires are good all the way back to the other end. After you find out
> where they go then you could run a continuity check or in this case a
> non-continuity. If the insulation is melted off, there had to be a
> problem, maybe the old tach, maybe not, maybe to much current running
> through them, if that is the case they could be melted in other spots.
> I would think that if a wire had gone to ground then there would have
> been a short that would have taken out the fuse or breaker. Do the
> wires themselves look burnt? A lot of times when there is too much
> current, the copper strands will be burnt, if that is the case, the
> wire is bad.
> Marty
> 95 BMC 37
> Kennewick Wa.
>




[Non-text portions of this message have been removed]

[Ryan Wright]

Sure, Art. As soon as I have more information and/or have solved my
problem I will post here.

-Ryan
'86 PT-40 8V92
Tri-Cities, WA

On 6/3/07, Art Weatherly wrote:
>
> I am very curious as to is fouind on this tach. problem. I am having the same
problem (tach doesn't work).
>
> I've been told that the sender is by the right by exaust manifold. I have not
found it. Whatever information you come
> across please post.
>
> Art Weatherly
> Riverside Ca.
> '85 PT36

[bloomas]

----- Original Message -----
From: Art Weatherly
To: WanderlodgeForum@yahoogroups.com
Sent: Sunday, June 03, 2007 8:47 PM
Subject: Re: [SPAM] Re: [WanderlodgeForum] Re: Tachometer doesn't work
Art Send me your phone # ill call you and tell you where the sender is
located.
Bob Loomas 1985 PT 36
In Grand Forks ND


I am very curious as to is fouind on this tach. problem. I am having the same
problem (tach doesn't work).

I've been told that the sender is by the right by exaust manifold. I have not
found it. Whatever information you come
across please post.

Art Weatherly
Riverside Ca.
'85 PT36
----- Original Message -----
From: Ryan Wright
To: WanderlodgeForum@yahoogroups.com
Sent: Saturday, June 02, 2007 2:31 PM
Subject: [SPAM] Re: [WanderlodgeForum] Re: Tachometer doesn't work

Hi Marty,

Thanks for the reply. We need to get together one of these days,
considering we're practically neighbors.

I guess I'll have to dig into my engine's documentation to see if
there is information concerning the tachometer connection point. If I
knew where to find that on the engine I'd at least have a place to get
started! Tracing the wire will be my first priority; if that's good,
then I'll fire up the engine and see if I'm getting a signal directly
from there.

I don't suppose anyone has a diagram of the tachometer system?? Would
be nice to know where the wires go, where any fuses or relays are,
etc.

-Ryan

On 6/1/07, martingregg598 wrote:
>
> Hi Ryan, personally I would want to be absolutely positive that these
> wires are good all the way back to the other end. After you find out
> where they go then you could run a continuity check or in this case a
> non-continuity. If the insulation is melted off, there had to be a
> problem, maybe the old tach, maybe not, maybe to much current running
> through them, if that is the case they could be melted in other spots.
> I would think that if a wire had gone to ground then there would have
> been a short that would have taken out the fuse or breaker. Do the
> wires themselves look burnt? A lot of times when there is too much
> current, the copper strands will be burnt, if that is the case, the
> wire is bad.
> Marty
> 95 BMC 37
> Kennewick Wa.
>

[Non-text portions of this message have been removed]





[Non-text portions of this message have been removed]

[Art Weatherly]

Bob, my # is 951 788 8717.

Art Weatherly
Riverside Ca
'85 PT36
----- Original Message -----
From: bloomas
To: WanderlodgeForum@yahoogroups.com
Sent: Sunday, June 03, 2007 9:11 PM
Subject: [SPAM] Re: [SPAM] Re: [WanderlodgeForum] Re: Tachometer doesn't work



----- Original Message -----
From: Art Weatherly
To: WanderlodgeForum@yahoogroups.com
Sent: Sunday, June 03, 2007 8:47 PM
Subject: Re: [SPAM] Re: [WanderlodgeForum] Re: Tachometer doesn't work
Art Send me your phone # ill call you and tell you where the sender is
located.
Bob Loomas 1985 PT 36
In Grand Forks ND

I am very curious as to is fouind on this tach. problem. I am having the same
problem (tach doesn't work).

I've been told that the sender is by the right by exaust manifold. I have not
found it. Whatever information you come
across please post.

Art Weatherly
Riverside Ca.
'85 PT36
----- Original Message -----
From: Ryan Wright
To: WanderlodgeForum@yahoogroups.com
Sent: Saturday, June 02, 2007 2:31 PM
Subject: [SPAM] Re: [WanderlodgeForum] Re: Tachometer doesn't work

Hi Marty,

Thanks for the reply. We need to get together one of these days,
considering we're practically neighbors.

I guess I'll have to dig into my engine's documentation to see if
there is information concerning the tachometer connection point. If I
knew where to find that on the engine I'd at least have a place to get
started! Tracing the wire will be my first priority; if that's good,
then I'll fire up the engine and see if I'm getting a signal directly
from there.

I don't suppose anyone has a diagram of the tachometer system?? Would
be nice to know where the wires go, where any fuses or relays are,
etc.

-Ryan

On 6/1/07, martingregg598 wrote:
>
> Hi Ryan, personally I would want to be absolutely positive that these
> wires are good all the way back to the other end. After you find out
> where they go then you could run a continuity check or in this case a
> non-continuity. If the insulation is melted off, there had to be a
> problem, maybe the old tach, maybe not, maybe to much current running
> through them, if that is the case they could be melted in other spots.
> I would think that if a wire had gone to ground then there would have
> been a short that would have taken out the fuse or breaker. Do the
> wires themselves look burnt? A lot of times when there is too much
> current, the copper strands will be burnt, if that is the case, the
> wire is bad.
> Marty
> 95 BMC 37
> Kennewick Wa.
>

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]





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