Electrical????????? - PeachParts Mercedes-Benz Forum

kchemers · #1 07-26-2010, 03:13 PM

89 300TE The other day the A/C would turn on and off, radio would turn on and off and radar detected would turn on and off. Checked alternator output and it was less than 11amps, put a new alternator in today (battery replaced 4months ago)car started, then engine would lightly surge and calm down, abs light and srs light would not shut off, engine died and will not start!!!!!!!!!!!
Any ideas?????????????

david s poole · #2 07-26-2010, 03:19 PM

check fuse in ovp relay.

kchemers · #3 07-26-2010, 04:11 PM

where is the ovp relay?

Merkey · #4 07-26-2010, 04:31 PM

Behind the battery, relay with a red top... fuse is in the top of it.

kchemers · #5 07-26-2010, 04:32 PM

found the ovp relay, it has 2 10 amp fuses, both were good any other ideas

kchemers · #6 07-26-2010, 06:26 PM

Now it has to be something in the blower motor, start the car run for a short time and the A/C blower starts and stops, the tach is bouncing all over the place, the turn signals are very weak, battery and alternator are new, ovp relay fuses are good, at a loss
Ken

kchemers · #7 07-26-2010, 06:27 PM

srs and abs warning lights are on

david s poole · #8 07-26-2010, 06:32 PM

check the positive battery cable and see if the aux wire is loose.common problem when battery replaced.

kchemers · #9 07-26-2010, 06:39 PM

both battery wires are tight

babymog · #10 07-26-2010, 07:33 PM

Replace the OVP relay.

kchemers · #11 07-26-2010, 09:55 PM

could it be the Klima relay or the ovp when ever I put a loud on the engine it bogs down, load like turning the blower on or the headlights or the radio

mpolli · #12 07-26-2010, 11:33 PM

Do a search on OVP. I don't have one so I don't have personal experience, but it can cause symptoms like that.

david s poole · #13 07-27-2010, 10:11 AM

what is the battery voltage with and without engine running?

kchemers · #14 07-27-2010, 02:38 PM

batt is fully charged now. has 13.05 when engine is off and running down to 12.24 when engine is on and no loads. I tried to get the relay to jump and activate myself by trying to power up the relay out of the car. when i test to see if the relay is getting power in the car terminals 15 and 30 both have batt voltage when key is turned on....shouldnt that mean the relay should close? I also have batt voltage running to the alternator shouldnt it be putting out power then too. I'm at a loss this thing is not as simple as an american car of its time.

david s poole · #15 07-27-2010, 03:49 PM

based on what you just said your brand new alternator is not charging.you said 13.05volts with engine off and 12.24 with engine running.the voltage is supposed to go up when you start the engine.are you sure that the serpentine belt is tight around the alternator pulley?