![]() ![]() If you have a question, please do not hesitate to call. Important: There were three different versions of the 70A alternators, so it is critical you correctly identify your alternator, as electrical parts are not returnable. ěrushes (you need two) or Brush Holder Assembly (You may use the brush holder assembly if you don’t want to solder).The basic components of an alternator rebuild are: Here’s a quick overview of both the 3.4L V6 and 2.7/2.4L I4:Įach engine has one of four different alternators they are usually marked with either the part number or the amperage. I've also posted this on Expedition Portal HERE Do you agree, or should I check something else before rebuilding or replacing the alternator?Ĭheers :xbeer3: and sorry for the long post This is leading me to believe that my alternator is on it's last legs. This seems normal as per SurePower's documented 0.8 to 1 V dropp. The Alternator output was 15.27 V (reading taken at the #A terminal on the Isolator again). As soon as the engin reved up the readings were, Main = 14.25 V and the Aux. I reached over and reved the engine while watching the multi meter. With the truck still runing (battery light still on). The Alternator output was 0.61 V (reading taken at the #A terminal on the Isolator) ![]() I took the readings again, Main = 12.14 V and the Aux. The truck was warm and I did not rev it up (RPMs approx 750). With the truck started and runing (battery light on). With the truck off I measured the battery voltage. The isolator has 4 terminals, #1 for the main battery, #2 for the aux battery, #A for the Alternator and #E for the exitation terminal. Click HERE for more details on this system. The main battery is an Optima Red Top 34/78 and the Aux battery is an Exide Orbital Marine Deep Cycle. I have a dual battery system and am using a Sure Power (model 9523A). I can just imagine what the neighbors were thinking.Īnyhow here is some background information. When I got home I dressed up since it's 5F here, put the head light on, grabbed the multi meter and headed out the door to the apartment parking lot. This evening my girlfriend informed me that the battery light came on after she started the truck on 2 occasions and it remained on for approximately 5 minutes or so. ![]()
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