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Saturday morning drive with Erratic Amp Gauge!

Howdy All You Opelers,

Just got back from a nice Saturday morning drive in my 71 GT. Planning to bring it (on trailer) to Springfield, Illinois for the Mother Road Festival car show. My one frustration (other than my difficulty getting in and out of my GT with a limited bend left knee) has been a amp gauge wanting to shoot way up in the positive range when revving the engine. During idle, the needle will drop back down toward zero (where it belongs); then go back up pegged in the positive range. While driving, the needle will stay pegged in positive for several miles, then drop back down to zero.
I'm hoping it is not the alternator (original style 35amp) or regulator (3 or 4 yrs old). Maybe a simple slipping of the fan belt? Oh well, I'll get it sorted out by the end of this month. I love driving my GT on a nice, cooler day. Also, always enjoy the looks from people in the neighborhood when they see a nice Red GT drive by. Will look forward to seeing my Opel friends in Springfield.
Randy
 

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Slowly getting the '71 GT (with its '69 engine) into shape where I will have some confidence driving it more than walking distance from my driveway. After finally giving up on the Solex a few months ago and going for a new Weber, I was still not fully satisfied with the way it ran and, upon further investigation, determined that I had a vacuum leak. A few of them, as it turned out. When I pulled the manifolds, I found that the exhaust manifold had the forward attachment ear broken off. Further, it turns out that the intake manifold was off of a later model Opel and had a connection for the non-existent EGR valve, a connection that had been closed off with an iron plumbing cap. The rubber cap covering extra port on the vacuum tree, for an automatic transmission modulator valve was old and cracked, as was the cap covering the port on the engine-side of the manifold where the line for the small hose from the valve cover was supposed to attach (that line had been attached to an extra port on the vacuum tree).

Jim in NH supplied me with a veritable collection of manifolds, from which I was able to cobble together a "correct" unit that I put into the car a couple of weeks ago. Many, many thanks Jim! Once together, the car is now running much better. Idles at 800-850, and runs down the street quite smoothly.

I did learn that the easier way to get the down pipe attached to the exhaust manifold is to remove the heat shield that is on the passenger side of the exhaust pipe (giving me a chance to clean it up and paint it) as well as the steel bracket that braces the bell housing to the engine block.

As I was buttoning up the exhaust system. I noticed some fluid dripping out of the passenger-side rear brake drum! Damn [expletive included]! Turned out to be a leaking bearing seal that I should have addressed way back when I did the brakes. Why should I think that the seals might leak just because the car had been sitting for ten years? When I got it apart this week, I found the O-ring seal was about one-third the diameter of the new one. But, one more step completed.
 

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RunOpel
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Little by little you eventually replace and/or remove and clean every piece on the Opel. Sounds like you are making progress.
Good luck and keep at it. Our reward is getting to drive it anywhere with confidence.
Dan
 

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Just Some Dude in Jersey
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Howdy All You Opelers,

Just got back from a nice Saturday morning drive in my 71 GT. Planning to bring it (on trailer) to Springfield, Illinois for the Mother Road Festival car show. My one frustration (other than my difficulty getting in and out of my GT with a limited bend left knee) has been a amp gauge wanting to shoot way up in the positive range when revving the engine. During idle, the needle will drop back down toward zero (where it belongs); then go back up pegged in the positive range. While driving, the needle will stay pegged in positive for several miles, then drop back down to zero.
I'm hoping it is not the alternator (original style 35amp) or regulator (3 or 4 yrs old). Maybe a simple slipping of the fan belt? Oh well, I'll get it sorted out by the end of this month. I love driving my GT on a nice, cooler day. Also, always enjoy the looks from people in the neighborhood when they see a nice Red GT drive by. Will look forward to seeing my Opel friends in Springfield.
Randy
Hmmmmm.......this sounds like it might be a weak battery. Some or all alternators don't do much charging at low rpms and don't kick in until 1000-1500rpm, so battery drain or no charging at idle and then a sudden spike at higher rpms as it tries to charge a dying battery. I suggest doing a voltage check of the battery engine off and then another check with the engine running. You should see more voltage at the battery when it's running, if you see less then you may have a problem. The battery voltage engine off should be no less than 12-12.5V and read about 13.5V when the engine is running. Check your wire tightness at the battery/starter/alt/voltage regulator. It could still be your alt or regulator or something else, but your description sounds like what I saw when I had bad batteries.
 

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Yesterday, Sunday, 9-15-19, I got my '75 Ascona RUNNING again! Three weeks ago, I lost spark. With work taking priority & the majority of my TIME, I can only work on my car on weekends under a shade tree behind my family's Industrial building (no garage).
It's 5am Monday morning, & I pray the car will start at 7:30 when I leave for work. The 2008 recession forced me from my home with a 3 bay garage to a condo. complex, where I'm only allowed 2 cars... my wife's, & ONE of my 3 daily drivers.

With the help of this board, I was able to NOT have to resort back to points.
My dilemma & how I ultimately fixed it can be found here: https://www.opelgt.com/forums/1b-ignition-system/109169-electronic-ignition-module-bad.html
 

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What did I do with my opel today?
Sat around dreading having to eventually crawl into that black widow infested abyss to pull my radiator out. She’s been sitting awhile since it took me forever to figure out my carb issue and I just gave up. Once I finally solved it (I hope) i quickly realized that I no longer have any excuse not to work on other things, but..... spiders. I understand that they are extremely unlikely to bite, but that doesn’t make them any less creepy.


Sent from my iPhone using Tapatalk
 

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What did I do with my opel today?

What did I do with my opel today? Actually a couple of weeks ago, I replaced my fuel sending unit, a royal pain, added rear louvers, replaced all the taillight bulbs and front turn signals with leds. Yesterday changed out the fan belt to a newer one, got a spare one and put it in the storage space. Today, went to Wally world and got 2 chairs to sit in. Did see an interesting item in the Automotive section, a set of 2 24" Led strips that might work in lighting for the floor tunnels. Today, trying to rest up for the trip to Charlotte for the Nationals, watching the rain come down, sitting on my butt. Jarrell
 
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I do nothing and I can do nothing.The GT are so far away from me.
Hartmut must pull off the Autotrans again.The Converter Clutch will not work.
The extra O -ring for the clutch must be fail.A lot of work for such small part:ugh:
 

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I do nothing and I can do nothing.The GT are so far away from me.
Hartmut must pull off the Autotrans again.The Converter Clutch will not work.
The extra O -ring for the clutch must be fail.A lot of work for such small part:ugh:
Yeah it's always the small things that get you. You just got to keep on plugging away. :yup: Jarrell
 

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finished the Eastwood degreasing,etching and sealing of fuel tank (looks freaking awesome) ran all new copper fuel line and replaced all fuel related vapor/return lines. Oh also removed a little filter by the carb with some sort of a floating restrictor in it and replaced with the 3 port filter to complete all the fuel system repairs.
Performed start up and she bounced around and ran choppy till she was warmed up guess I need to re-tune carb or something to fix. Really strange as it was running really well before I put her back together as designed.
 

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RunOpel
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There seems to always be something we can do on our Opel :yup: I prefer not driving mine in the rain (probably the only one that does this), but here in the pacific northwest, that would mean you don't drive it for 3/4 of the year :no: Yesterday was a drencher so I just sat in it and listened to music for awhile. Oh I had plenty of other things to do, but just wanted to relax for awhile. Am I the only weird one that would do something like that???

Dan
 

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Can Opeler
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not at all Dan I sit in mine and listen to the blower run that I cant shut off and pretend its the air blowing through the hair I don't have.
If your glove box is in bad shape you can cut out the cardboard box inside of it and access the switch for the heater and the wires on top of the heater to fix them (as well as all the wiring behind the dash).

I’m going to make the glove box on my car renovable for this reason.
 

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ahh cool idea i disconnected,filled and looped the heater core when i redid the cooling system so i wouldn't sweat anymore than i already do in the summer taking mine on test drives
 

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RunOpel
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Kyler I have thought of doing some modification to the glove box just to have access to the heater core and blower motor. I wonder if anyone has modified their glove box. I'm reluctant to do it at this time, my dash pad/glove box is original and in extremely good condition. But if someone has come up with a modification that would look decent, I would be incline to try it. I wonder what others think about this topic?
Dan
 

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I will definitely look at that the dash is in normal big cracked shape and i put some carpet on so i wouldn't be reminded and distracted from the things i have been working on
 

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Speaking of radios Dan mine i think is original and was disconnected at fuse i found hidden so i hooked it up, installed an antenna which was to much fun thank goodness for wire hooks and there's a problem with the speaker wire in back of the radio i move it one way it sounds good i let go and sounds like aluminum foil running across the road so i disconnected it i would like to keep things as original as possible but my son and i like our music a little louder than normal do they make aftermarket radios with today's features that look like original and would fit in the same spot or should i turn the glove box into a flip down radio panel lol
 

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If your glove box is in bad shape you can cut out the cardboard box inside of it and access the switch for the heater and the wires on top of the heater to fix them (as well as all the wiring behind the dash).

I’m going to make the glove box on my car renovable for this reason.
My heater works manually. I open and close the valve by hand.:lmao: However if I have to remove the dash again, I thought about using a choke cable and cut the pull part off, and heat and bend the dash cable around a nail then run it to the valve and heat and bend accordingly. Just a thought. Jarrell
 
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