5g alternator problem and 5g-4g loom swap question

Post by **Drax** » Sat Jan 23, 2016 8:52 pm

a mates 5g f22 uses a square plug for the alternator. his alternator failed (went of fire) tonight, but has two spare 4g ones.

-first question is, could he cut the wires for current 5g f22 alternator plug, and cut & paste (yes, im using the I.T term) the 4g loom plug over and connect it up so he could then use the 4g spare alternator.

he would just get a replacement 5g f22 alternator but he has a h22 (from a 4g) ready to be swapped over next weekend. he has a 4g loom too if required.

-second question is, if and when he does the f22 to h22 swap, is he best keeping the 5g wiring loom and making some changes to the plugs for the new engine, or swapping to the 4g wiring loom which im sure will cause problems with the 5g f22 ecu and injector resistor wiring..?

mercutio · Post by **mercutio** » Sat Jan 23, 2016 10:19 pm

theoretically it should work but why not get a proper alternator that way the loom stays intact and less issues going forward i have a couple of new 5g alternators

Post by **Drax** » Sat Jan 23, 2016 10:33 pm

@Fithotblonde

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Sun Jan 24, 2016 8:00 am

Really? (the username, not the situation and proposed fix).
You know what they say...

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Sun Jan 24, 2016 10:55 am

If you're going to the trouble of hacking looms about to make a 4g alternator fit in order to save the cost of buying a replacement, you might as well just take the old one off and repair it yourself.
It will take about the same amount of time, be a better solution and probably not cost much.
Regulators (I assume that's what's failed?) are normally easy to pick up and it's easy to change them.

fithotblonde · Post by **fithotblonde** » Sun Jan 24, 2016 11:49 am

Thank you for your comments.The reason I don't want to buy a new one is because I had planned on getting a whole new engine fitted next Saturday but now I can't drive the car to where it is having the work done. The M.O.T is also due so I need to keep costs down as much as possible.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Sun Jan 24, 2016 12:02 pm

Ah, right... That makes some sense.
Have you already secured the new engine? If so, can you not borrow the alternator from the new engine?

fithotblonde · Post by **fithotblonde** » Sun Jan 24, 2016 12:46 pm

I have a h22a off a 4th gen and it's being fitted to a jdm 5th gen.So the problem is the alternator plugs are different.So am a bit stuck with what to do

mercutio · Post by **mercutio** » Sun Jan 24, 2016 12:53 pm

ok you have already had a fire with your own alternator have you sussed out why that happened ? what caused that? then your going to chop up the wiring to the alternator to splice in a 4g plug making the wiring to the alternator that just burst into flames that little bit less safe.? for the sake of how much?

sometimes you can penny pinch in the wrong places these are not Supercars but they are pretty technical

fithotblonde · Post by **fithotblonde** » Sun Jan 24, 2016 1:03 pm

It was only an idea would you pay up to 100 quid for something you only need for a week