Electrical

Alvaroxyz · Unread post by **Alvaroxyz** » September 5th, 2014, 8:44 pm

Hi, i have a question for you experienced guys. I own a m151a1, electrical harness is a disaster. I saw on ebay the front harness for $120, and back for 40. But they are for A2 model.
If i buy it, what modifications for the back one and front one do i have to do to install it??
I'd have to add a wire for the blackout light next to the spare weel??? A1 Back lights have the same 3 wires that A2 has?
Or do you have a special web page to buy A1 wires??? ( rapco, eriksurplus and a couple more didn t answer my emails.
Thanks for your time!

Alvaro Martinez from Uruguay

Alvaroxyz · Unread post by **Alvaroxyz** » September 5th, 2014, 8:44 pm

Amperes issues???? Or are all the same??

Alvaro Martinez from Uruguay

Floyd · Unread post by **Floyd** » September 5th, 2014, 9:16 pm

Alvaro, This might help with some of your questions.

g838.org/viewtopic.php?f=3&t=7131&p=59272&hilit=Use+A2+harness+for+A1#p59272

Floyd

Unread post by **rickf** » September 5th, 2014, 9:34 pm

Floyd, that did not come through as a link and I cannot trace it.

Rainman · Unread post by **Rainman** » September 5th, 2014, 9:49 pm

http://www.g838.org/viewtopic.php?f=3&t=7131&hilit

Alvaroxyz · Unread post by **Alvaroxyz** » September 5th, 2014, 10:50 pm

Ok, i read that and now i have an idea of what i should do to modify the a2 to a1.
Another question, anybody can recomend me a site where i can safetely buy an a1 harness??
I don t understand this if ( for example) there is a main wire harness for a2 for 60 amp, anotherone for 25 amp..etc or if it is the same "universal a2" harness and the difference is in other part of the jeep?
(This question also applys for a1 wireing)

Thanks again!

Alvaro Martinez from Uruguay

Unread post by **rickf** » September 6th, 2014, 9:59 am

The A1 harness has some extra wires for the oil pressure safety switch that turns off the electric fuel pump until there is oil pressure. If you do not have the electric pump or if you want to wire the pump to come on with the ignition then you do not need this feature. The other key difference between the A1 and A2 is the 25 amp generator on the A1 and 60 amp generator (alternator) on the A2. The wiring is different for these also. You can get an adapter harness to put a 60 amp generator in an A1 though so you can still use an A1 harness with the 60 amp generator. if you were to use the 25 amp generator with an A2 harness then you would have to make some modifications to put in the voltage regulator.

Alvaroxyz · Unread post by **Alvaroxyz** » September 9th, 2014, 10:26 am

Ok, so i have my 25 amp generator installed in my A1, i buy the a2 harness ( i think is cheap, here making a wireing for a jeep costa arround $900!!) and the only " problem " i would see is that the generator plug is different??? Can i cut my older plug and "paste it " in my new harness?? Is that posible, and works?? And the same for the voltage regulator??

Thanks again!!!

( i have no idea of electrical sistems, wires, plugs etc!!!! I am not a mechanic of cars, i try to do everything on my jeep to learn about it and be proud of doing it. Thats why y make sooo many questions!!!)

Alvaro Martinez from Uruguay

Unread post by **rickf** » September 9th, 2014, 12:08 pm

It is going to be a bit more involved than that since the 60 amp alternator has a built in regulator. There will be some circuits that will need to be added. I would have to have the A2 ans A1 diagrams in front of me before I can advise on what has to be done. Also, I forgot to mention before that the rear harness of the A1 will have the wire for the electric fuel pump and the A2 harness will not have that wire or any of the fuel pump circuit. There is a way around that though. Do you still have the electric fuel pump in the tank?
Here in the US it is 1100.00 US to have a harness made!

whiterabbit · Unread post by **whiterabbit** » September 9th, 2014, 1:42 pm

I've modified harnesses on motorcycles, late harness on early bikes so here's how I do it and my 2cents.
You get alot for your money buying the A2 harnesses. Looks like you can use over 90% of it. Stretch them out on the shop floor and label the connections with tape. ID any unneeded circuit. You can get the tag/circuit numbers here. Take your old harness and do the same. Lay a note card describing any new circuit/connection you need. If you have an unneeded circuit see if you can use it to convert to the style harness you need. Any new runs of wire you could scavenge from the old harness. Tape wrap the new runs onto the A2 harness or totally remove and rewrap. (I wouldn't do that till I knew it worked)
By the way I sux at electrical but that's what I'd do instead of coughing up almost a grand!

Alvaroxyz · Unread post by **Alvaroxyz** » September 9th, 2014, 4:02 pm

Ok, whiterabbit s idea was what i was planning to do if the wires help me! I dont have the electrical fuel pump, i have an external universal fuel pump electric, and just bought a mechanical A2 fuel pump, and i think thats the one im gonna use.
~Another quiestion i have is, for example the wire from the electrical pump, if i dont use it, can i cut it and add it in the back harness to install the blackout light next to the spare tire?? Will that work properly??
~ the A2 harness i saw in ebay was composed of :
-front wireing harness
-back wireing harness

The installation of A1 is also like that? Two "parts"??
In that case, it will be good to buy the rear a2 and add that bo light, or thats a huge mistake!!!??

Thanks!

Alvaro Martinez from Uruguay

Fil Bonica · Unread post by **Fil Bonica** » September 9th, 2014, 7:01 pm

If you have access to an alternator I would use it instead of the generator.
It makes wiring much simpler for that part.

Fil Bonica

Unread post by **rickf** » September 9th, 2014, 7:43 pm

Yes the A1 is also two parts. If you are asking if you can cut out the fuel pump wire and use it to extend the rear tail light wire, yes you can. The blackout circuit is already there. You will not want to run a new wire the entire length for the blackout light. Do a search for "14 gauge military wire". You might be able to buy short lengths like 10 feet (3 meters) to use to make up extensions and new sections. That would be much better than using 40-50 year old wire which is probably crumbling as it is.

Alvaroxyz · Unread post by **Alvaroxyz** » September 9th, 2014, 11:16 pm

Tomorrow ill post a photo and you tell me if its a generator or an alternator!! I dont know the difference!!! But i think ita generator.

In case ill have to convert, is this what i need??

Im likeing the idea and being positive of doing this way, im taking notes for the day ill get to do this. Just bough the rear harness, thanks to your advice!!!

Ill post that tomorrow to go out of doubt.thanks for your time!!

Alvaro Martinez from Uruguay

Alvaroxyz · Unread post by **Alvaroxyz** » September 9th, 2014, 11:17 pm

Tomorrow ill post a photo and you tell me if its a generator or an alternator!! I dont know the difference!!! But i think ita generator.

In case ill have to convert, is this what i need??

Im likeing the idea and being positive of doing this way, im taking notes for the day ill get to do this. Just bough the rear harness, thanks to your advice!!!

Ill post that tomorrow to go out of doubt.thanks for your time!!

Alvaro Martinez from Uruguay

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