Charging troubles
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Posting Guru
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From: Perry Georgia
Charging troubles
HAPPY NEW YEARS!!
I have a 1987 F250 with a 6.9 Diesel. As I was coming home from Christmas with my family my alternator froze up. As in the bearings locked up. I worked them loose with a socket and WD40 to get me home. At this time the alternator was still charging. I was changing the alternator without unhooking the battery's (BAD move). Somthing sparked behind the alternator. I stopped at this point and drove the truck home where i had the tools I needed. When I hooked up the new alternator, no charging so I bought a new voltage regulator and installed it. No charging. I checked the wiring and found a burned fuseable link. I fixed that and now the factory voltmeter goes past the normal range for charging as in maxing out the guage. I shut the truck off since it was climbing like it was about to max out the factory voltmeter and I didn't want to watch the wiring go up in smoke due to overcharging. I called one shop and they tell me to drive the truck to them (25 miles) so they can check the charging system. I'm not to sure of that since the way the voltmeter was moving, I'm looking at the wiring going up in smoke since I only ran it less than 20 seconds and the voltmeter was climbing FAST toward the max. Any ideas???????????
I have a 1987 F250 with a 6.9 Diesel. As I was coming home from Christmas with my family my alternator froze up. As in the bearings locked up. I worked them loose with a socket and WD40 to get me home. At this time the alternator was still charging. I was changing the alternator without unhooking the battery's (BAD move). Somthing sparked behind the alternator. I stopped at this point and drove the truck home where i had the tools I needed. When I hooked up the new alternator, no charging so I bought a new voltage regulator and installed it. No charging. I checked the wiring and found a burned fuseable link. I fixed that and now the factory voltmeter goes past the normal range for charging as in maxing out the guage. I shut the truck off since it was climbing like it was about to max out the factory voltmeter and I didn't want to watch the wiring go up in smoke due to overcharging. I called one shop and they tell me to drive the truck to them (25 miles) so they can check the charging system. I'm not to sure of that since the way the voltmeter was moving, I'm looking at the wiring going up in smoke since I only ran it less than 20 seconds and the voltmeter was climbing FAST toward the max. Any ideas???????????
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
You did not say if you had A/C or not, if you have A/C you have an external regulator and if you do not then you have a regulator in the A/C Generator.
Either way you need to check the Yellow wire with a white stripe going to the fuse link "J" (14 GA-GRN) that you burned up.
This is your "A" wire and tells the charging system how much charge the battery has, if this wire tells the charging system the battery voltage is low then the A/C Generator will charge for all it has got.
Either way you need to check the Yellow wire with a white stripe going to the fuse link "J" (14 GA-GRN) that you burned up.
This is your "A" wire and tells the charging system how much charge the battery has, if this wire tells the charging system the battery voltage is low then the A/C Generator will charge for all it has got.
Thread Starter
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Posting Guru
Joined: Aug 2006
Posts: 1,049
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From: Perry Georgia
My truck has A/C. After deciding not to run to town overcharging I put the old voltage regulator back on. No more trouble. I did take the truck to the place to see if they could figure out why the new regulator didn't work but when they checked out the new regulator on their machine, it checked good. Another one of lifes mysteries solved. Almost!! Oh well, alls well that ends well. Anyway,HAPPY NEW YEAR!!!!!!!!!!!!!
