Iput a new voltige regulater in my car and it worked for a few days then started to over charge when I step on the gas the amp meter gos up when Itake my foot of the gas it goes to the midel where its suspost to be the heater moter will speed up at the higher rpm Iput a new voltige regulater in and it worked good for a few days now its doing it again the car is a 88crysiler fifth ave 318
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Re: the batery is geting 18volts of charge
First of all make sure your battery is in good condition, and then get a voltmeter attached to battery, before start & after to confirm what your inside gauge is telling you is correct. Check and clean all connections to & from battery. Otherwise it's pointing back at regulator again.
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You may not have needed to buy a new battery, depending on the age of the battery and the year of the vehicle. I have owned these mini-vans for over ten years now and one problem they seem to have is build up under the positive battery post. This is usually an oxide of some kind building up on the battery post from the battery acid and then isolating the battery cable end from making contact with the post. All I've ever had to do is clean the battery post and cable end and tighten it back up and it works fine. Battery post treated washers (red and green) help this as well as putting battery terminal grease on the cable end once installed to keep corrosion from building up again.
If you have a side post battery situation you'll need to take the battery cable off the battery and clean up the bolt with a wire brush and inside the battery connection with a small wire brush kind of like a bottle brush since the threads are not very big. After cleaning apply a "thin" coat of dielectric grease. This grease is conductive and will give a better contact and keep corrosion away.
if the batery is old enough it could be that it just can't hold a charge any more, check that the batery terminals are in good dhap and not curoded, it doesent take much to distrupe the current flow to and from the batery
alternator's go bad - even some new ones are no good - prolly a rebuilt one gone bad - test it -- charge the battery - - then drive it in the day time to the local advance or auto zone - they will test ur charging system - also - take down the vin number and ask the local dealer if there have been any recalls or service bulletins - on ur car -
When you touch the hot wire to the manifold you may have damaged your alternator. Take your Blazer to your local car service center such as Advance auto and have them run a test to make sure your rebuilt alternator is charging. Most centers will do this free of charge.
Looks like you have replaced all of the key parts, and then some. At this point I would verify that the alternator is charging the battery. With engine off, check battery voltage. Start the engine and check thre voltage again. It should climb to charging voltage, around 13.0 to 13.5 volts. If it doesn't, check all connections. On a vehicle this old, I would start with the ground circuits.
It is the alterntor, if the charging system was ok the engine would continue to run. Make sure the battery is fully charged (engine cranks fast) before you replace the alternator or you could burn out the new alternator from overheating.