Mikes72 Posted October 3, 2020 Posted October 3, 2020 Hi guy's I'm having a problem with my cars charging system. The other day my alt light came on. So off to the parts store I go. Grabbed a new alt, after the install the light stayed on, tested the new one in the car 7.2 output. 🙄 I thought maybe I just got a bad 1 out of the box ? Grabbed other one, 14 volts on the bench 😃 now its only 4.3 after install in the car ?? Quote
MC1of80 Posted October 4, 2020 Posted October 4, 2020 The voltage regulator is most likely the culprit. Quote
Mikes72 Posted October 4, 2020 Author Posted October 4, 2020 Is the car supposed to run an external voltage regulator. I've been putting in 1 with an internal ? Quote
MC1of80 Posted October 4, 2020 Posted October 4, 2020 Hmmm. Good question. I know the 70s and 71s do. Do you have a black box bolted to the radiator core support on the driver's side, under the charcoal canister with wires going to it ?   Quote
Mikes72 Posted October 4, 2020 Author Posted October 4, 2020 Yes there is ? A horn relay ? Under the charcoal box Quote
Mikes72 Posted October 4, 2020 Author Posted October 4, 2020 Opps 2 different things. I'll grab a voltage regulator tomorrow and see if that's my culprit. I'll keep you up to date.... I love this club !!!! Quote
cbolt Posted October 4, 2020 Posted October 4, 2020 So did you buy and install an alternator with an internal regulator already, or did you replace your alternator with one with an external regulator? Just curious because i have no idea what would happen if you installed an internally regulated alternator on a car with an external regulator. Quote
MC1of80 Posted October 4, 2020 Posted October 4, 2020 cbolt, if he has an internal regulator alt he could jump out the wires at the regulator and it will work. Quote
Mikes72 Posted October 4, 2020 Author Posted October 4, 2020 Turns out it's an external regulator, which has burned up another internal 1 I had installed. The guy's at the parts store are real buttnuts and kept giving me internal !!! So here's the new plan. I've read on here about a conversion kit from M&H automotive elecrical #27555 $21.00 plug and play it will be here Tuesday 1 Quote
cbolt Posted October 5, 2020 Posted October 5, 2020 The kit is inexpensive and you will be much happier with the internally regulated alternator if you drive your car much. If you are looking for factory original you will want to find a source for new regulators that arent made in China. I got frustrated with the fail rate of the external regulators and switched to an internally regulated alternator which has provided years of trouble free service so far. I used the "kit" which is essentially a jumper plug for your regulator connector. Well worth the few bucks. Quote
1970mcss Posted October 5, 2020 Posted October 5, 2020 I thought someone here had just made jumper wires, maybe Paul Bell  Quote
MC1of80 Posted October 5, 2020 Posted October 5, 2020 You can make jumpers. Google it and watch a few YouTube videos. Ez pz. Quote
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