Originally Posted by killerbee
Blown88GT: My understanding the function of the alternator is that it produces DC with a ripple voltage on it (how much ripple I do not know). A good explination is here: http://www.alternatorparts.com/under...lternators.htm
. The figure you provided looks like DC to me
The alternator is rated at 130 amps but under normal operation the current flow to the battery won't be anywhere near that high. I gather that the current flow is determined by its impedance and the leadwires. If the 8ga lead was shorted then this might be possible. That is why both ends of the 8 ga wire have fuseable links installed.
After talking to Brian from DCC it would seem that alternator is not able to cope with the sudden change in load when the fan is switched on. In addition as noted by bronzesink8 the battery has been partially isolated from the alternator so it can not effectively act as a buffer/accumulator to aid the alternator.
After talking to Brian I will install the DCC box and think that it will solve the problem.
Yes, it's DC with lots of ripple, just like the link you provided:
If you ever see 130A, you've got a big problem. If it's shorted, you've got 600A (battery CCA) through the charge wire.
130A alternator can only produce full rated output for a very short time, 130A rating is peak rating, more like 100A continuous rating.
Alternator response time is determined by the type of voltage regulator. Some respond faster than others. It's called LRC (Load Response Control). Heavy-Duty regulators do not have this feature and will be slow to respond.
8AWG is rated for 68A inside a hot, enclosed space.
4AWG is rated for 136 inside a hot, enclosed space
Brian is THE MAN. We both did some tests. Mark VIII inrush current with relay = 100+A; Mark VIII inrush current with DC35 = 65A. Fan power wires are 10AWG.
1988 GT, 57k mi, Orig Owner
ProCharger P600B, FRPP Headers, Flowmaster F2, 3G Alt, Mk8 Fan/DCC, 3.55's, Prog Springs, ST Brace, G/Trac Bar, Subfrms, UCA, LCA, FCA, Tokico 5-ways, C/C Plates, CSA 16x8, Bridgestone RE760 Sport 225/50R16, Megasquirt DIYPNPF60, LC2 WBO2, C&L76mm MAF w/LU47's