GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.
Home » Public Forums » GMCnet » Exhaust bang bang bang (going down steep grades)
[GMCnet] Re: Exhaust bang bang bang [message #366836 is a reply to message #366832] Fri, 17 September 2021 05:02 Go to previous messageGo to previous message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
Senior Member
There should be 3 leads on your tachometer: +12VDC, Ground, and Signal.
Signal goes to that Tach connector on the distributor cap.

Ken H.

On Thu, Sep 16, 2021 at 10:11 PM wrote:

> Ken Henderson wrote on Thu, 16 September 2021 13:01
>> If you'll look carefully at the extension on the side of the HEI
>> distributor cap, where the wire's connected, you'll see that there's a
>> second connection tab there, labelled on the side of the cap as "Tach".
>> Guess what...
>>
>> Ken H.
>
> Good one Ken, I got the message no problem. The cap was pretty dusty and
> after I cleaned it off I could see the words.
> I'd like to ask more about how to actually connect here and if I decide to
> install a tach in the dash, is this where I would tap into?
>
> Anyway, before getting the answer about the tach take-off on the
> distributor cap, I'd borrowed a digital tach and stuck a reflector on the
> harmonic
> balancer.
> After she warmed up, my idle averaged about 720-740 in park so we tried
> bringing it down with the throttle screw adjuster ..... without success.
> The screw backed off but the throttle cable/linkage didn't follow so I
> pushed the throttle closed and got her down to 640-660. Exercising the
> linkage
> back and forth the stop was more and more prone to sit at the screw
> setting and finally gave the whole linkage/shaft/cable etc a good drink of
> silicone lubricant which seemed to do the trick.
>
> Putting her in drive, she idles at the high 500's with no sign of
> stalling or choking so maybe that's ok? Haven't been down any steep grades
> since,
> but I'll report back after I do the next run.
>
> Larry
>
> --
> Larry - Victoria BC -
>
> 1977 Palm Beach 40,000 miles, PO said everything working but forgot the
> word NOT. New Atwood fridge, water heater & furnace. New SS exhaust system,
> 6000w Onan, Iota Converter, R134A A/C, New fuel lines & heat exchange hoses
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:

Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: Axle Rebuild
Next Topic: Radiator cooling fan
Goto Forum:
  


Current Time: Tue Jul 02 02:40:08 CDT 2024

Total time taken to generate the page: 0.00822 seconds
.:: Contact :: Home ::.

Powered by: FUDforum 3.1.1.
Copyright ©2001-2021 FUDforum Bulletin Board Software