[Shop-talk] electrical problem with truck

[DAVID MASSEY]

 That's pretty high.  If the current is 10A you will have a 3 volt drop across that cable.
 
Dave 

 
 
-----Original Message-----
From: john niolon <jniolon at att.net>
To: DAVID MASSEY <dave1massey at cs.com>; shop-talk at autox.team.net <shop-talk at autox.team.net>
Sent: Mon, Aug 9, 2021 2:57 pm
Subject: Re: [Shop-talk] electrical problem with truck

#yiv1494141348 body {margin:0.7em;}#yiv1494141348 body.yiv1494141348OECFntDef, #yiv1494141348 body.yiv1494141348OECFntDef div {font-family:Tahoma, Verdana, Arial, Helvetica, sans-serif;font-size:12pt;}checked all ground connections and resistance thru cables neg post on battery to ground bolt in frame  0.37 ohmsall 1/0 cables read 0.2 to 0.3 ohms 
----- Original Message -----From: DAVID MASSEY <dave1massey at cs.com>Reply-To: DAVID MASSEY <dave1massey at cs.com>To: <jniolon at att.net>, <shop-talk at autox.team.net>Sent: 8/9/2021 2:02:32 PMSubject: Re: [Shop-talk] electrical problem with truckCheck between frame ground and battery negative.  A rusty connection there can cause all manner of similar problems.

Dave 



-----Original Message-----
From: john niolon <jniolon at att.net>
To: shop-talk <shop-talk at autox.team.net>
Sent: Mon, Aug 9, 2021 12:55 pm
Subject: Re: [Shop-talk] electrical problem with truck

#yiv1494141348 body {margin:0.7em;}#yiv1494141348 body.yiv1494141348OECFntDef, #yiv1494141348 body.yiv1494141348OECFntDef div {font-family:Tahoma, Verdana, Arial, Helvetica, sans-serif;font-size:12pt;}sorry for slow response... helping daughter and sil move...priorities!!! Monday a.m. report

fresh charge on battery 40 amp for 30 minutes on saturday trickle charger since then .. battery voltage 13.4 this a.m. checked with two different meters


hooked up H.F. 500 amp load tester, voltage reading same as VOM at 13.4
voltage at frame rail terminal also 13.4

battery has 800 CCA capacity
started test... over 15 second test the battery slowly dropped to 320 amps and voltage read 10.8 (still in the green scale)
stopped test at 15 seconds and two minutes later battery was back up to 12.7





next step will be check alternator output at battery and terminal point

ok... started truck... engine at 1200 rpm
meter on alternator o/p- voltage is 14.6
meter on battery voltage is 13.5

hmmm...1.1 volt drop in 4' of 1/0 cable....that don't sound right
need to measure resistance of cable I guess...

as an aside... checked voltaged between frame ground and the case of the alternator... 0.0001 volts

I also took battery back to Wal mart and Quintella checked it...  battery is good based on her years ofbattery experience
  
----- Original Message -----From: john niolon <jniolon at att.net>To: shop-talk <shop-talk at autox.team.net>Sent: 8/6/2021 8:58:12 AMSubject: [Shop-talk] electrical problem with truck#yiv1494141348 body {margin:0.7em;}#yiv1494141348 body.yiv1494141348OECFntDef, #yiv1494141348 body.yiv1494141348OECFntDef div {font-family:Tahoma, Verdana, Arial, Helvetica, sans-serif;font-size:12pt;}
jeff….     regular led acid battery ??     Everstart Maxx27 800 CCA  regular Walmart battery When it died, did any of the electrical items still work?  Lights, etc.?  when it first occurred ,, when I tried to restart, .. starter just clicked and I remember the a/c fan still blowing  Donald...  How large is the cable from the alternator to the battery?   feed from battery to alternator is #4 wire
 Dave... I was thinking a dirty battery clamp.    battery clamps are new this year and clean, no corrosion on connections John...   How is the volt meter in your truck grounded, to the frame or to the motor?    voltmeter in dash is grounded to dash frame  voltmeter used to check under hood is grounded to frame not engine.  I'll go back and check ground connections. Alternator has a ground terminal of it's own... it's #10 wire grounded to the frame and of course the alternator is grounded through it's mount. Pat...  what is the relationship between the frame terminal & the rest of the electrical system?  Terminal on the frame rail is fed by a 4' piece of  #4 wire from the i/p solenoid lug where the cable from the battery is connected to the solenoid. Jimmie..    What's the voltage at the terminal with those accessories 'on' but the engine 'off'    hmmm ?? don't remember checking that, …  I'll do that How big is the alternator?    100 amp single wire from CVF racing ya'll have given me lots to check and recheck and some I haven't thought of...   going back through my diagnostics and check connections too.  I bought a 500 amp load tester yesterday and will put sufficient load on the battery.  Battery is under the cab and I have to lower it to check it out and with the low truck, I have to raise truck on jackstands.. silly me, I thought battery would be a low maintenance item ...duh.   so checking at a shop somewhere is a very large pain. points I'm considering.... larger ground wires from frame to engine.... alternator to frame and check resistance from solenoid lug to the terminal on the frame...   the saga continues thanks for all the replies and points to check..   you guys are the best john _______________________________________________

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