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Discussion Starter · #1 ·
I searched, but didn't find anything to answer the question. I know several members have installed the Denso type alternator and I want to do the same.

First, what do you have to do to mount the Denso alternator? It appears that there is a mounting bracket on the alternators, but it is rather narrow. What did you use for a bracket?

Also what type of Denso alternator did you get. I would like it to be chrome. I have seen many on Amazon, but I am reluctant to get it yet with so many unanswered question. Any advice or comments would be appreciated. I am kind of up against the wire, I want to make Kool April Nites in Redding, CA, Hope I can get some information before I leave Wednesday morning. Going right past Summit Racking on the way.

Thanks,
Bob
 

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Dieter: I have read through those threads, lots of information. The alternator that I want to put in the GT is smaller (physical size), They are not car specific. Take a look at the link:

[ame]http://www.amazon.com/LActrical-OUTPUT-CHROME-ALTERNATOR-WARRANTY/dp/B00BP0Y6LI/ref=sr_1_1?ie=UTF8&qid=1429581211&sr=8-1&keywords=chrome+one+wire+denso+alternator[/ame]

The reason I want to use this one is the size. It's only 5 1/2 inches long, five inches from the mount to the back, and just under 4 inches thick. This would fit nicely. The only thing I see as a challenge is the mount. If you look at the pictures in the link, it only has one tab to mount the alternator. The tab is only 7mm wide. I don't think that is enough to keep the alternator in place without breaking the mounting tab. I don't know if a GM type mounting bracket would work. I appears that the mounting bracket goes around the alternator to hold in place without breaking the mounting tab. They come in 70 amps which is more than I need any way. They are a little pricey but what the heck, it's only more money in the black hole.

So I guess my main question is what do I use for a mounting bracket? It is interesting that it doesn't have a second mounting tab like most other alternators. I am hoping someone has made the switch and I would like to know if it was a store bought bracket or did they have to make one, and if they made it, how?

I would just like to be able to have a smaller alternator and this one fits the bill, unfortunately there isn't too much information on the brackets, at least none that I could find to apply to my 2.4 engine. Probably not too much of a market for Opel brackets.

Bob
 

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Discussion Starter · #5 ·
Dan, yes that's a hot one alright, might even go that route before its over. Do you have any information on brackets? Seems like that is the weak part of the upgrade for me right now.

Bob
 

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Home made seems to work best.

Consider upgrading your alternator charging wire if you are pulling significant amperage.
 

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Opel Key Master
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I used the Nippon alternator with my serpentine belt system, but it wasn't enough power at idle. Of course I had a stereo, power steering, fuel injection, and A/C. It only puts out around 35 amps at idle and max was 70, if running a fairly stock car, it probably isn't an issue, but for my application, I had to go with a bigger Powermaster alternator that cost around $400!
 

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Discussion Starter · #12 ·
Lindsay, good find, it looks pretty rugged and pretty easy to install. I will be taking pictures for anyone interested. With the size of a denso type alternator it should be an easy install. Thanks, I am going to order it and will go from there.

Bob
 

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Discussion Starter · #13 ·
OK, I ordered the universal bracket, looks strong. I will take pictures of the installation and post them here.

Bob
 

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Our famous GeorgeOpel bypassed the current limiter.
He used the cig lighter port for voltage readings:p
The volt meter in the cigarette lighter works good. At idle I get 13.4 and between 13.4-13.6 while driving. ( probably a little " lost" voltage due to CIG plug vs battery:feedback:
This is with the stock 45a? Opel alternator.
 

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Opeler
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I have been using Denso compact alternator since I Installed A/C system in my GT. A/C compressor was installed in the place of original alternator and I had to switch to compact alternator installed on the passenger side of the engine.

Denso 70A alternator works fine for me but I learned few things in the process:

1. Denso comes with very small pulley. Keep it, standard Opel pulley is larger and slows down alternator RPM, lowering its output. The picture shows my cogbelt pulley but alternator comes with V-belt pulley.

2. The foot of alternator is very narrow, so it requires very sturdy bracket to prevent vibrations. I made my own bracket, extending the alternator support with longer pivot bolt and extra bracket ear (see the picture).
Also, the diameter of the hole for the alternator pivot bolt is 10.3 mm so using 10mm bolt will leave alternator loose. Rather than reaming the hole to 12mm or switching to SAE bolt size, I bushed the hole with precise fit to 10mm pivot bolt.

3. The alternator is not equipped with the stator tap, so the charge control light is not working on our Opels.
I sent an email to the supplier asking them what is needed to make charge control light to work. If they answer, I will inform.
 

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Discussion Starter · #19 ·
What happened? :confused:
Lindsey, actually it is being put on this week the bracket and the alternator. I am not doing the work. After getting my GT running, I took it to Kool April Nites in Redding, CA. Great car show. I couldn't get the GT to idle so I took it to my buddies mechanic, he only works on vintage cars. He got the idle as close as he could, but there was a big puddle of oil under the car, so that took care of my car show aspirations. Bob, the mechanic said the GT had intake leaks, and he would track down the oil leak, and fix a couple other things. I left the GT with him, and he has been on vacation, so this week hopefully everything will get done. Interestingly Bob has worked on Opels before, so I felt better about leaving the GT with him.

So as soon as I get the GT back, I will take pictures of the bracket and the alternator. Bob is going to install both. I wish I could take step by step pictures, but after all these years, I just needed someone else to finish the final touches.

Bob
 
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